ASSUMING that we're going with all my characters at their peak, the answer is technically....

her

the autistic nine year old who did nothing wrong in her life

not that Damian would admit it

autism be damned our kid can work a [umineko spoilers redacted]

omg

i didnt know you play maria

shes on my muselist but i haven't had an opportunity

damian would get pretty far but ultimately get obliterated, even if i'm generous and put him at batman 666 mode where he's functionally immortal.

my second fave umineko, i'm so delighted to see you play her

honestly maria vs. chara would be a HELL of a match for [umineko spoilers]

yeah lmfaoooo

though i wouldn't underestimate peter's ability to just put all these insanely powerful kids in lonely timeout

it's fine they came prepared with so many newspapers

the thing is i think a lot of them are by and large smarter than peter