Well we can start with Fiend Folio, which somehow didn't have a Birthcake to start with!

FIEND'S CAKE
"Pyromancy up"
Raises the maximum amount of fireballs Fiend can have at a time by one per multiplier.

THE BASTARD'S CAKE
"Lingering resentment"
Tainted Fiend's Malice form leaves behind a trail of sticky tar creep. Trinket multipliers make the trail larger.

GOLEM'S CAKE
"Caffeinated gilding"
Grants the Midarizer an additional guaranteed use per floor for each trinket multiplier.

SLIPPY'S CAKE:
"Spread down"
Reduces the spread of Slippy's innate triple shot.

CHINA'S CAKE:
"Caution up"
For each Broken Heart China has, she gains tears but loses speed.

...♥♥♥♥ i forgot
Uhhhh

TAINTED FIEND'S CAKE:
"Lingering resentment"
Malice's creep trail now damages enemies. The damage scales with the trinket multiplier.

anyway im on a roll :) here's retribution!

ICARUS'S CAKE:
"Risk + reward up"
- Upgraded enemies have a multiplier-based chance to turn into champions.
- On Normal mode, champions have a multiplier-based chance to drop double the rewards.
- On Hard mode, champions are guaranteed to give their drops.

MAMMON'S CAKE:
"This Birthcake Sponsored by Buta Corp."
- When paying out with an item, Swine Beggars have a multiplier-based chance to additionally drop a stat capsule.

THE BURNOUT'S CAKE:
"Legally counts as cursed"
- Counts as a Cursed Trinket.
- Can spawn wherever a Cursed Trinket could spawn, but only once per floor.
- Automatically smelted on pickup.
- Has a base sell value of 7 coins.

引用自 tatarasanuarturliviu：

Tarnished character birthcake ideas

Sacrifice: looks rotten
Once items become blight and are consumed, there is a 25% chance of gaining extra inventory space.
Every time this happends there is a 50% chance for the trinket to be consumed.

Fervency: arrested for too much love
If tr Maggy were to lose one of her heart containers due to her having negative hearts on her meter, then the trinket is consumed instead and the bar is resseted back to zero.

Isolation: more rocks
The throwing bags now generate 33% more rocks when thrown.

Attrition: it has its own shadows
The shadows now deal contact damage to enemies.
The shadows also have a small chance of fearing the enemies, whenever an enemy passes trough one of the shadows.
The radiance also has a small chance of inflicting the Radiant Gaze status effect on enemies, whenever an enemy passes trough one of the shadows.

Farrago: bigger creeps
When tr ??? vomits, the last creep puddle is double the size and lasts for twice as long
When tr ??? poops, the first creep puddle is double the size and lasts for twice as long
When tr ??? explodes, the creep puddle is double the size and lasts for twice as long

Momentum: you’re not yourself when you’re hungry
If tr samson were to die from immortal rage, then the trinket is consumed and tr samson stays alive.

Corruption: double debug
The next item to be debugged will be doubled (as in tr eden will get 2 copies of the same item) and the trinket will be destroyed
if its an active item, then the item will have the car battery effect

Reverie: its very fragile
Losing the divine remnants holy mantle by taking damage from an enemy will cause the trinket to shatter into 6-12 mantle shards.

Avarice: no matter the cost
If tr keeper uses his turnover while not having enough coins, then all of his coins will be taken and turnover will activate and the trinket will have a chance of disapearing.
the chance for the trinket to dissapear is dependent on how much money tr keeper has compared to how much it costs to use turnover (the more money, the lower the chance; the less money the higher the chance; and a 100% chance of disapearing at 0 coins).

2/3rds of your suggestions involve the trinket being removed. That kind of goes against having a trinket at all. There were quite a few of those in the original mod, and now they're down to just 2 characters, being Judas (saves you from an otherwise fatal devil deal) and Laz (another revive) which are in theme for the character and dont typically happen unless you want it to or they're a last effort save. As for feedback on the effects themselves, I might take time later to reply to all the ones suggested so far. Later meaning...whenever.

Eevee cake when

引用自 Pokechu08：

Eevee cake when :GDNormal:

in ten thousand years maybe

for community remix:

ADAM'S CAKE:
"Equilibrium"
- Slightly reduces negative multipliers given by The Apple.

TAINTED ADAM'S CAKE:
"Burning calories"
- Original Sin will now drain soul hearts if it runs out of red hearts to drain, extending the mode for longer at the cost of being riskier

ABEL'S CAKE:
"Contagious love"
- Gives a 12.5% chance for charmed enemies to explode into another Kidney Bean fart when they die.

The Martha of Bethany:


Martha's Cake: "Hope is sought" The throwing cross' cool-down is 3% faster and has homing.

Tainted Martha's Cake: "Break open the prison door" The spike ball can now break open doors and secret rooms.

Delayed Rot: makes items take one more room/second (idk how the rot works) before becoming blight

Made with love: all hearts dropped from cardiac arrest are full hearts (includes the soul heart from the birthright)

Bag filler: The next bagged item will have its efect doubled, upon doing so, destroy this trinket

From within: Adds a shadow clone that stays in between judas and the frontal clone

Creep conserver: all creep costs are reduced by half (takes 2 regular uses to remove a charge)

Blood for blood: Has a chance to restore some health while in the immortal rage state

Debugged: when killing a glitched gaper, gain one debug charge

Restoring remnants: Allows for an extra hit that does not break divine remnants

Free real estate: The first use of turnover on a floor will be free of charge

I hope this one is better than the other one i saw... Feel free to share an opinion too.

Arachna:


Arachna's Cake: "Twin Birth" An extra spider comes out of spider eggs you make.

Tainted Arachna's Cake: "Larger Cloth" The radius of Divine Cloth is increased by 3%.

Sacred Dreams:

Dream Guard's Cake: "Sweet Dreams" - Spawns a bedroom every floor, all bedrooms come with a Dreamer's orb pickup in the center.

引用自 tatarasanuarturliviu：

引用自 Trio：

TARNISHED BIRTHCAKES?!

Tar.Isaac:

Delayed Rot: makes items take one more room/second (idk how the rot works) before becoming blight

Tar.Magdeline:

Made with love: all hearts dropped from cardiac arrest are full hearts (includes the soul heart from the birthright)

Tar.Cain:

Bag filler: The next bagged item will have its efect doubled, upon doing so, destroy this trinket

Tar.Judas

From within: Adds a shadow clone that stays in between judas and the frontal clone

Tar.???(Blue baby):

Creep conserver: all creep costs are reduced by half (takes 2 regular uses to remove a charge)

Tar.Samson:

Blood for blood: Has a chance to restore some health while in the immortal rage state

Tar.Eden:

Debugged: when killing a glitched gaper, gain one debug charge

Tar.Lost:

Restoring remnants: Allows for an extra hit that does not break divine remnants

Tar.Keeper:

Free real estate: The first use of turnover on a floor will be free of charge

I hope this one is better than the other one i saw... Feel free to share an opinion too.

cool, here is my opinion
tr isaac; it seems ok but almost insignificant (its just one room) (also you can check the isaacguru wiki or the epiphany wiki to know how the rot works)
tr maggy; seems really powerfull, almost too powerfull compared to birthright (how about like only 20-25% of the hearts are full hearts)
tr cain; really good, just one question: does it fill the whole bag or does it just double the power of the bagged item?
tr judas; it sounds good, but how does it work with the angel form? (there is supposed to be only one radiance)
tr blue baby; definetly better than what i came up with, congrats
tr samson; sounds pretty good
tr eden; way better and more interesting than what i came up with, i tip my hat to you
tr lost; i dont think that is really in the theme of the whole lost character (especially since this one is more about risk vs reward)
tr keepper; pretty cool, but it seems like its just a more permanent version of the silver dollar trinket (which pretty much does the same thing)

Ok so first off:
Tar. Cain: doubles the power of the bagged item

Tar. Judas: Just adds a regular (black shadow) in-between Judas and the radiance (mostly to proc on hit effects)

Second off:

Tar. Mag: I agree with you, maybe it being chance (not luck based) is better

Tar. Lost: it's like the holy cross trinket, as in, preserves the charge of the item, and upgrades it, without losing the actual on hit proc.

Tar. Keeper: maybe I'll think of something else, something around the "midas curse" passive.

Tar. Isaac: same as tar keeper, maybe something around the dice recharge not "fully" destroying a non-inventory item.

I currently can't edit the original rn, but I will take that into consideration, especially if there are more tar characters in the future (Hopefully tar laz next?)

引用自 Trio：

引用自 tatarasanuarturliviu：

cool, here is my opinion
tr isaac; it seems ok but almost insignificant (its just one room) (also you can check the isaacguru wiki or the epiphany wiki to know how the rot works)
tr maggy; seems really powerfull, almost too powerfull compared to birthright (how about like only 20-25% of the hearts are full hearts)
tr cain; really good, just one question: does it fill the whole bag or does it just double the power of the bagged item?
tr judas; it sounds good, but how does it work with the angel form? (there is supposed to be only one radiance)
tr blue baby; definetly better than what i came up with, congrats
tr samson; sounds pretty good
tr eden; way better and more interesting than what i came up with, i tip my hat to you
tr lost; i dont think that is really in the theme of the whole lost character (especially since this one is more about risk vs reward)
tr keepper; pretty cool, but it seems like its just a more permanent version of the silver dollar trinket (which pretty much does the same thing)

Ok so first off:
Tar. Cain: doubles the power of the bagged item

Tar. Judas: Just adds a regular (black shadow) in-between Judas and the radiance (mostly to proc on hit effects)

Second off:

Tar. Mag: I agree with you, maybe it being chance (not luck based) is better

Tar. Lost: it's like the holy cross trinket, as in, preserves the charge of the item, and upgrades it, without losing the actual on hit proc.

Tar. Keeper: maybe I'll think of something else, something around the "midas curse" passive.

Tar. Isaac: same as tar keeper, maybe something around the dice recharge not "fully" destroying a non-inventory item.

I currently can't edit the original rn, but I will take that into consideration, especially if there are more tar characters in the future (Hopefully tar laz next?)

sorry to say this, but its over
the dev gave up on modding, we wont be getting these birthcakes

Eclipsed character birthcake ideas

Unbidden: special protection
Causes all of the lemegeton wisps that the unbidden has to shoot homing tears that deal 3 damage

The Infinite: checkpoint
While holding the trinket the rewind counter cannot go below 25%
If the infinite tries to take a devil deal that would set the counter below 25% then all of the other devil deals in the room will dissapear

Nadab: helpful Abihu
Causes abihu to chase down enemies and bosses, inflicting them with burn
Abihu prioritises enemies that dont have the burn status effect

The Profane: smells burnt
Causes enemies and bosses to be atracted to Nadab's Body for 5 seconds before going back to chasing the profane

Beyond character birthcake ideas

Cross: extra yummy
while holding the trinket, a yummy trinket will spawn at the beginning of every floor
this trinket is yummy by default

The Little: extra minis
while holding the trinket, 3 mini trinkets will spawn at the beginning of every floor
this trinket is mini by default

The Rotten: more and stronger friends
while holding the trinket, increases the chances of finding pest related items (aka fly and spider related items)

The Husk: more and varied friends
while holding the trinket, increases the chances of spawning locusts and arachnids

Sin: sinful
while holding the trinket, causes all of the sin items to be able to appear in all item pools (with a 15% increased chance of appearing)

The Atoned: virtuous
while holding the trinket, causes all of the virtue items to be able to appear in all item pools (with a 15% increased chance of appearing)

The Researcher: extra actives
increases the chances of finding active items

The Confused: extra trinkets
while holding the trinket, researched trinkets have a 25% chance of replacing regular trinkets, if a regular trinket were to spawn

red baby character birthcake ideas

!!!: stronger revive
while holding the trinket, all of stat ups that red baby gets from being revived are doubled

The Drenched: pissing the floor
while holding the trinket, going to the next floor will make the bladder fill to its maximum level (level 6)

...: retrieving everything
while holding the trinket, using retrieve, will retrieve all of the lost body parts at the same time regardless of distance