Alright so, for starters we got some issues mainly for crouching, since some characters don't have animations for it, I also be putting here what vehicles they can drive/or problems with what they can drive if they get to drive and how fun they are to really play

Seem to play fine and drive vehicles, crouch fine same for the Boonie Marine
However like I said, strangely only the Boonie Marine can throw frags and since you play as him on AotCR I'll tell you what he can drive
No Scorpion capability
Can drive the Ghost but can't aim the guns, they always shoot straight ahead of the Ghost
Warthog is fine
No Banshee capability

Works fine, I've played a different Mod which made you play in a Grunt Campaign in CE so I have experience for this little fellow from before.
Also the camera is in his chest rather than his head, so it's a bit funky when you're being shot but can't see over a tiny hill because of that.
Since you play on TaR I'm not sure what he can/can't drive. Though I must say for being a Spec-Ops he is very weak

Arguably the most agonizing to play, his speed is on par with the AI Marine (Slow), he has very low health, and he can't crouch either.
Only can drive the Warthog but since he has Marine Animations maybe the Ghost.

Is alright, though the Flood can be real rough since it's on 343 Guilty Spark (Basically consider yourself ♥♥♥♥♥♥ if a Infection Form grabs onto you at any point, Combat Forms aren't as bad if they don't go for melee)
Luckily I've played a different Mod which has a campaign as a Jackal so I also have experience here.
Can crouch, which is also how you use the shield, though you can't see it in first person.
Not sure what he can drive since it's on 343 Guilty Spark.

Play basically the same, not sure what they can drive either considering the levels
Suffer from Jackal syndrome in that when you get a Infection Form on you you're ♥♥♥♥♥♥
Luckily you can use basically any weapon, have a great melee and great jump height; and you sort of "die" like other Combat Forms, you lose your weapons but you have a chance of getting back up when this happens.
You can also lose your limbs which is annoying but makes sense.
Also, they don't really crouch, when you try to you just do that slow walk you sometimes see them do.

Arguably the most fun, has no infinite Active-Camo like the AI Stealth Elites though, does have light shielding to keep the angry popcorn off you.
Compared to others, you're also equipped with quite the arms, I'm talking my guy could throw a >110 Mph pitch at you, which means easy sticks with a Plasma Grenade if you can aim even a little.
Crouchs fine
Can drive basically anything as long as it isn't Human origin, which makes sense and unlike the Boonie Marine can aim the Ghost guns.
(Extra Note: Getting into the Wraith will soft-lock you, as Elites don't have a animation for getting out, so unless you flip it over you're trapped in it.)

I'll avoid Chief since it's just Chief, works fine.
And Captain Keyes basically just plays like a reskinned Marine, just the level is agonizing because you're basically a Marine against the Flood.
Also other than some being better than others, melee seems to be universal even if they have no animation for it, but if they do (Like the Elite or Flood) it generally does way more damage and has more range like the AI.

Wow the amount of things I hadn't noticed, thank you again for reporting these bugs/failures so I can fix it much easier you saved me a lot of time!

I have to start by increasing the health of the bipeds like the grunt or the crewman and configure all the bipeds (or in some missions) so that the infection forms do not kill you instantly

And see how I can configure the vehicles so that everything works well, I may have to make some changes to the map

It is common for the mod to have many things to fix or improve since when I uploaded it I could barely try it, I only checked that the characters were playable ...

No problem, glad to help
It really was a fun Mod for the most part, the balancing isn't too bad and I could probably do this campaign on normal until the Library.
But the later Flood levels are near insanity just from Infection Forms and the sheer amount of enemies.

Elite was my favorite, mostly because I'm biased for Elites and the fast movement + baseball league level grenade pitches is VERY fun.
(Extra note about him, the camera is also more akin to being in his upper-chest, doesn't make for good cover peeking)

However still like you did warn, I can't recommend this on anything higher than normal, maybe the first levels can be done but the later Flood levels will break you.

1 more thing! idk if this supose to be in game or not but the flood ai will kill you al tho you are flood too

The new "Incomplete Human" has a bug right at the beginning where when the dude tells you to get out of the cyro pod thing it does not work cuz I am not in the pod so I can't play the first level.

It is the only level that you have to play on the Heroic - Legendary difficulty since due to the tutorial the character gets stuck and cannot continue!

oh k thanks for telling me I was on normal

hey so i was wondering, the camera is always placed so you can see whats in front of you, but for the elites and i think the grunts and jackal that isnt the case, could you try to make it like the other ones because aiming is quite difficult in a lot of cases in these particular levels sadly

I have tried it with other "Character Cameras" but the result is almost the same

I would have to leave it in first person to fix that but you wouldn't be able to see the character :/