Every creature in the game and exactly how care decides which one you get. One egg → a random baby from one of four genera → and from the very first stage, how you raise it picks the lineage, then good vs. rough raising steers each branch. Same 4-Shade Green look as the app.
211 forms · 4 genera · 32 lineagesIgnore a call (hungry / sad / sick / messy) too long = a care mistake, counted per stage. Few → refined forms; many → wilder ones.
Lots of snacks or force-feeding raises weight + overfeed — in Blobkin, a refined teen that's overfed becomes Dumplin.
A Blobkin feral teen left sick with low health becomes the frail Runtling instead of its adult.
A noble adult raised well its whole life (few lifetime mistakes, trained, healthy) can ascend to a rare stage-5 Elder — one per lineage.