Taco is a female contestant on Inanimate Insanity and Inanimate Insanity IV. Taco's nonsensical behavior and tendencies made her well-liked by the viewers. This, plus her winning multiple immunities on Team Chickenleg and in the merge helped her make it to the finals. When she lost in the final challenge to OJ, she revealed her more sinister and manipulative side, fleeing after attempting to steal the cash prize. Though not as a competitor, Taco returned as the secondary antagonist of Inanimate Insanity II. She committed a few schemes in hiding, most notably working with Microphone to split the cash prize until pushing her too far. Towards the end of II2, she realized her villainous ways and intense investment in the game had cost her all her friendships, and began to seek redemption and attempted to repair the relationships she'd lost, with mixed results. She returns to competing in Inanimate Insanity IV as a member of Thematic Cats, while also continuing her journey of becoming more ethical. She is voiced by Rheagan Rizio.

Pickle is a male contestant on Inanimate Insanity. Despite his dim wit and siding with the outcast Taco, being placed on the superior Team Chicken Leg kept Pickle safe into the merge. He was eliminated in "The Penultimate Poll" with 329 votes, placing 4th overall. Though not chosen to compete in Inanimate Insanity II, he appeared as a supporting character in a few episodes. He is voiced by Derek Napolitano.

Cabby is the winner of Inanimate Insanity Invitational and a supporting character in Inanimate Insanity IV. She is voiced by Casey Landman. Putting her trust in Test Tube, she was originally eliminated in "Best Served Cold" after a unanimous blindside vote against her, but she was able to rejoin the game in "I Am Chocolate!", after staying on Indefinite Island. She competed for herself in the merge before the finals, where her showcase of strategy, loyalty, and redemption within the game won her said game in a 7-6-2 vote by the jury, beating out fellow finalists Balloon and Silver Spoon. As of "The Future Is Today!", she is a co-leader of Inanimate Island, alongside the other winners, OJ and Suitcase.

Yin-Yang are male recommended characters, created and voiced by Marco Bonomo (BFDIdubita23), they were a contestant in Inanimate Insanity II, being put on The Bright Lights. They were eliminated in "Let Er' R.I.P." with 1859 votes, placing 15th overall. They competed on Inanimate Insanity Invitational, formerly as a member of The Thinkers, and became an independent contestant after the merge. He worked with The New Old Thinkers, working closely with Cabby throughout the show, additionally receiving the Immunity Milk. Upon Blueberry's rejoin, Yin-Yang was tricked into losing his advantage and subsequently got eliminated in "Blue Buried" with 4 votes against him, placing 6th overall. They are both voiced by Marco Bonomo. Both seperate are He/Him, both together are They/Them.

Apple is a female contestant on Inanimate Insanity and Inanimate Insanity II. A fan-created character recommended by totaldrama23, Apple had a chance to join Inanimate Insanity in "War De Guacamole," ultimately doing so by winning a paintball challenge. She would be placed on Team Epic, but clashed with fellow teammates Marshmallow and Paintbrush multiple times. Her disdain with Marshmallow in particular caused her to be eliminated in "The Great Escape" with 244 votes. Apple was the seventh previous contestant chosen to participate in Inanimate Insanity II. Placed on The Bright Lights, she made amends with Marshmallow. However, a ploy from a certain jealous ex-contestant caused her to look like she was using Marshmallow to advance in the game. Once this ploy was revealed to Marshmallow, the two made amends once more and moved to Purgatory Mansion together. She was eliminated in "Everything's A-OJ" with 2,045 votes. She is voiced by Adam Katz.

Microphone is a female contestant on Inanimate Insanity II and Inanimate Insanity IV. In Inanimate Insanity II, Microphone was placed with The Grand Slams. She placed 6th overall, quitting the show in "Hatching the Plan". Microphone currently competes in Inanimate Insanity IV as a member of Thematic Cats. She was formerly voiced by Stephanie Pines, and has not yet been recast.

Cherries are male competitors in Inanimate Insanity II and Inanimate Insanity IV. They are voiced by Derek Napolitano.