Fakeout's design itself i really like! Hoever, you kinda lost me with the tails and knuckles designs, unlike fakeout they both have more human-esque body types, which makes them look kinda cursed, in fact, they'd be better off if you drew them with their regular body types, children are somewhat androgynous, so tails could have a body type similar to her official counterpart, and for knuckles you could have also given her her regular body type or if not, look at tikal as a point of reference.
Amy is a girl, but you never see her having chunky limbs or defined joints, she has the same rubber hoose inspired look sonic has.
I do like eggy's design tho, that one's neat, i'd just make bro taller tbh.