Abstract: An extremely
overpowered character/item who's sole purpose for existing is to easily beat/counter any obstacle put in front of them.
A Little Timmy Character (abbreviated as LT character in this) is a character in fiction who's purpose is to be powerful/more powerful than a previous powerful predecessor. Most LT characters are products of insecure people projecting themselves with OCs that can solo all of fiction, or bad authors creating a bad plot. The isekai genre is infamously chock full of LT characters, most of which being the "person who appears weak but is actually really fucking strong" sub-genre.
The naming derives from the power logic of elementary children, as almost all of their
powerscaling arguements
boil down to "nuh uh, because my character can actually _____ which just so happens to convienently counter your character's ______."
A good way to identify a LT character on the fly is to check two things: their role in the story and their
powerscaling's simplicity-to-power ratio. However, this method can be unreliable if the character's reasoning for existence requires more research compared to the average read session, so take the results of this test with a grain of salt. It is heavily recommended to do your own research on the character's, well, character first.
Important note: Not all overpowered characters are Little Timmy Characters. No examples will be provided due to controversy with differing opinions :P