i dont really know...i treat my tamagotchi almost differently every time and ended up with different characters. on my v3 i got leaftchi/furawatchi once and on my v2's a couple times
i got billogotchi and i got full training and treated him VERY well. like playing games for happy etc mt growth was like this...baby>tamachi>patapatpatchi>billogotchi. hehe i was aiming for mametchi