from left to right (and youngest to oldest), we have:

vin - n / uzi / v. they/he. definitely takes more after their disassembly parents in personality. confident and playful, yet capable of being vicious if it comes down to it.

andrei - doll / lizzy. he/him. quiet, attentive. he's good at finding out secrets when no one thinks that he knows them. doesn't speak unless you actually know him. his name is a callback to yeva being russian eve, his is russian andrew.

vienna - v / j. she/her. lived most of her early years with j, but ends up brought into the nuziv household after a while. her personality is similar to j's, but not as strict or stuck-up. she's well capable of having fun and finds her place in her family with her little sibling and adoptive cousin.