I treated my v5 normally which usaullly turns them into Petite family, but this time they were a viotletchi and a clock-thing. Its always the way, when i neglect them, they look cute, if I take good care of them, the get ugly..
If your talking about V5,which i'm pretty sure you are.It dosen't realy so much matter on the care.It realy depends on bonding.If you want another characters besides the Petite family,I suggest you feed them more often.
P.S The "clock thing" is name Furikotchi and is obtained as a result of low bonding.