I remember reading somewhere about a superhero that was rediculously all powerful because he beat someone else who was all powerful (like Thanos or someone), but he was something crazy like a Bunny, or a Squirrel. And all of his victories happened off camera so no one actually saw it. He might have even been a joke character
Sounds like Squirrel Girl. She’s defeated Dr. Doom, Thanos, Mandarin, Giganto, MODOK, Terrax, Baron Mordo, Fin Fang Foom, Wovlerine and Ego the Living Planet, mostly off camera.
Squirrel Girl wasn’t really portrayed as “ridiculously all powerful”, so much as just somehow managing to always win fights she had no business winning. Her powers are basically squirrel-like abilities and the ability to talk to squirrels.
She was a member of the Great Lakes Avengers (a team following in the footsteps of the Inferior Five), and has been the nanny of Luke Cage and Jessica Jones’ daughter. She was 14 when she started out (she ambushed Iron Man, teamed up with him to fight Doc Doom, then beat Doomsy when Iron Man was laid low). Her sidekick is her pet, Monkey Joe.
Those are just her overt powers. She also has a secret superpower: Winning.
For your enjoyment, here she is fighting Wolverine. (Amusingly, some time before that comic, we had a thread about creating arcs to turn various heroes into villains. Mine included Wolverine refusing to discuss an encounter with a villainous Squirrel Girl.)
There’s another X-Men comic – Wolverine #8, but I can’t tell you which Wolverine series it was – where Emma Frost is rummaging around in Wolverine’s mind. She comes to a door marked “Sexual Fantasies.” Foolishly, she opens it. Inside, you see Mystique, Emma Frost herself, Squirrel Girl, Spiral, and Psylocke, all equipped in whips and chains bondage gear.