If it depended on me everyone that put feet on sunny would be on the crew.
Vivi? of course she's smart on the no shady side of things (acts as straight man) + Karoo is a bonus (Karoo mor ebounty than chopper gag)
Carrot, sure, she likes being there, they like her being there
Caribou? Put the man in, infinite storage of stuff and useful as a spy
Cesar Clown: after i discovered what he done to big mom would love him to be like the lowest in rank of the crew and everybody punishing him
And for Sure Yamato should be on the Crew, Oda trolled hard there and is my second biggest disapointment with one piece.
1st being Vegapunk and 3rd being post TS Sanji