This market resolves to when the champion becomes playable on the main client and servers, not the test servers.

I am tired of most League of Legends champions being basic hot humans or humanoids and think Riot should design and release more "creature" type champions. Although Riot has explicitly said they design less of these because of less general appeal.

For a champion to be considered "creature", I expect the champion to not simply walk on two legs for most of the game and not have generally humanoid features.

The most recent champion to qualify for this would be Smolder, then before that Naafiri. Before that, Bel'veth(?) or Lillia. I'd be willing to hear arguments if another champion like Bel'veth came out whether she counts. I'd say she's "humanoid" considering how her body shape is, posture is, and way she talks. Also, she spends the vast majority of the game not in her more monster-like state.