Basing my line up on the original 6 members.
PEEK A BOO
Plucked from Earth 1, and given a Mother Box, which enhances her teleportation to inter-dimensional levels. She’s charged w. transporting and leading the team.
(Blink plucked from the AoA, given the Tallus and the same mission.)
WITCHFIRE
In her reality she’s the daughter of Starfire and Raven (yeah, THAT happened). She combines magic and energy manipulation. Her hybrid physiology gives her superior strength and speed.
(Nocturne was the daughter of Scarlet Witch and Nightcrawler.)
PLASTIC MAN
Seems no different than the Plas from Peek-A-Boo’s world, which likely means the difference is particularly strange, but subtle and not yet revealed.
(Morph became secretly possessed by Proteus.)
GENERAL GLORY
From a reality where WWII never ended. Shellshocked from killing so many ppl over the last nearly 80 years. The enemy, terrified by his actions, view him as the Horseman of Death.
(Thunderbird was Apocalypse’s Horseman War, and mentally unstable.)
CHANGELING
Comes from a seeming paradise for superheroes, where he is a huge celebrity.
(Mimic came from the same type of reality, and enjoyed his status there.)
SUPERBOY PRIME
From a reality where Supergirl remained Darkseid’s slave. He wasn't born w. Full Kryptonian strength/speed, but did inherent DS’s Omega Beams amped so as to dwarf his father’s. Physical contact w. SBP turns anyone to stone.
(Magnus was Magneto and Rogue’s son and contact w. him turned anyone to steel.)
OBERON
An agent for an unknown entity, he unceremoniously recruited the team and gave Peek-A-Boo a power amping Mother Box. Contacts the team through the MB and tells them which reality needs fixing next.
(The Time Broker served the same purpose in the Exiles series.)