The Wolf and the Lamb Passive speculation
Okay, so this is probably a weird idea for a thread here. But I think it's connected to the lore of this new champion.
If they are the representation of Death, or life and death, Most likely two aspects of death, because if they both came from death, they can't be anything else than form what they originated: Lamb probably represents a peaceful death, while the Wolf represents the violent one. The passive for this champion could be that after a certain amount of time, it has to change to its other shape, i.e. if it was the Lamb, then when "the time runs out" it has to switch to Wolf, and the other way around. It would be similar to Gnar, but Gnar's transformation is governed by your usage of spells. Think about it.
When Death comes, it can't be outrunned. It can't be "stopped" (modern science would beg to differ, but hey, this is a fantasy world)
Pros of this passive? Wow never seen before Cons: imagine transforming in the middle of a teamfight. Will you even notice you became a lamb? Daym.