Bananasauros
Bananasauros (sic) is a species of grass/dragon-type Pokémon and a specific character who first appears in Sonichu 11, episode 23. As his name suggests, he is a yellow bipedal dinosaur around the same height as an Electric Hedgehog Pokémon with a body shaped like a banana, including a black "stem" on his head, and strange gray spots.
Sonichu 11
Bananasauros is introduced when Simonchu and Sandy Rosechu bring in a fossil to the CWCville Museum, which is subsequently revived by an unnamed Rosechu scientist. He is initially in a smaller, non-banana-shaped, spotless form called Bananasaur, and becomes "Bananasauros" after evolving (a few pages later) when Punchy feeds him Pocky - a highly confusing naming convention given that "-saur" is simply an anglicized form of "-saurus". Punchy subsequently brings him home and introduces him to Layla. Other characters are initially incapable of understanding Bananasauros, but Punchy and Layla are soon shown to somehow read his thoughts.
Chris informs the reader through Bananasauros' internal monologue that he was in fact a high school "seinor" named David Rotgard, a self-described "expert rad gamer" who "loved the heavy metal and hard rock", a "B- average student" with an ex-girlfriend named Caitlyn, who he had recently cheated on with another girl named Henny. David recalls crashing his car while listening to AC/DC on the way to play video games with his friends, then waking up as Bananasaur at the musum.
At Punchy and Layla's house, he demonstrates his ability to play God of War. Punchy then takes him to a day care center and forces him to have sex with a Ditto in the form of a female Bananasauros to produce two Bananasaur eggs. Punchy and Bananasauros play Scrabble, and Punchy spends the rest of the day training Bananasauros to fight, upsetting Layla to the point of breaking up with him in the process. Punchy soon gets upset with Bananasauros' stereotypical teen male behavior.
Background
Bananasauros first appeared (in Bananasaur form) in a piece of commission artwork Chris did in 2014, playing Scrabble with Punchy as he does in his official Sonichu debut. The character presumably belongs to the commissioner, and this may be the source of his bizarre backstory of being a high school student as well. Chris seems to believe Bananasauros is a major draw to the comic, and mentioned his appearance while shilling his Patreon in CLog 06232017, despite the fact that no one but the original commissioner previously knew about the character.