To find where each relic can be obtained, navigate to the relic discovery tab (in-game) and hover over the relic to reveal which character it belongs to (if no character is listed, it can be found on any character).

Bag Of Flex - Gain 2 Flex
Bag Of Poo - Gain 2 Poos
Bag Of Frost - Gain 2 Ice Cubes
Bag Of Lifesteal - Gain 2 Vampires
Bag Of Brain - Gain 2 Brain s
Bag Of Axe - Gain 2 Axes
Cursed Charm - Gain +66% Luck, But Perk Choice Decreases By 1
Red Envelope - Gain 25 Income
Pretzel - Overclock Generates 200 Energy
Credit Card - Gain 40% Shop Discount, But Lose -25 Income
Cactus - Gain 10 Thorns
Red Chili - Gain 25% Attack Speed
Oni - 20% Chance To Launch Flex When You Critically Hit
Braveheart - Launch +1 Axe For Every 100 Healing Received
Rice Ball - Gain 22 Health Regen, Gain 66 Energy Regen
Baguette Bread - Axe Base Damage Increase By 20
Horse - Gain 1 Flex, Gain 200 Max Health
Apple - Gain 8 Armour
Sushi - Receive 1000 Heal 6s After Battle Starts
Lobster - On Permanent Thorns Gain, Gain Equal Amount Of Strength
Knife - Gain 6% Crit Chance, Your Ult Can Crit
Bald - Gain 4% Dodge, You Can Dodge Ult Now
Garlic - After Deal 60 Damage By Thorns, Heal 30
Enemy Controller - Gain 1 Ninja
Coffee - Trigger All Startup Perks And Relics Every 6s
Pig - +15% Chance To Launch Poo On Poo Hits
Squid - Gain +4 Income After Defeating An Enemy
Chopsticks - Gain 3 Vulnerable. When You Deal Thorn Damage, Deal It An Additional Time
Bag Of Music Note - Gain 2 Music Notes
Bag Of Coin - Gain 2 Coins
Halftime Champaign - Ultimate Damage +150%, But Energy Regen Reduced By 80 After Launching The First Ultimate
Bag Of Screw - Gain 2 Screws
Complete Core - Startup Get 1 Robot
DVD - Robot Base Damage +20, Robot Can Crit And Share Your Crit Chance
Blue Print - Required -1 Screw To Create A Robot
Super Bomb - Robot Explosion Damage +100%
Null - Gain +1 Strength For Every 50 Debt Before Battle Starts
Economy Knot - Deal Damage Equal To Your Debt x3 To The Enemy Before Battle Starts
Cool Head - Startup Gain 1 Depress For 3 Secs
Pot Of Greedy - Perk Choice Increases By 1, Max At 4
Dark Duel - When Selecting Perk Before Combat, You Can Choose A Perk From The Deck Of The Last Defeated Enemy. Has 4 Waves Cooldown
Bag Of Wheat - Gain 2 Wheat
Bag Of Shark - Gain 4 Sharks
Bag Of Milk - Gain 2 Milk
Bag Of Tomato - Gain 2 Tomatoes
Bag Of Red Tea - Gain 2 Red Teas
Bag Of Water - Gain 2 Waters
Blocked - 20% Chance To Immune Hater Damage
Forced Transactions - Shop Price Increases By 100%, Get A Duplicate When Purchasing Anything
Diamond Head - Pig(ID) Damage Increases By 50% Of Ultimate Damage
French Fries - Gain 1 Angry Ego
Ruler - Trigger Startup When Entering Depress

Hope this helps!