I don't mind doing a little training arc to force Mel into :3. I'm pretty sure our timelines can work out? I'm looking at anything after our thread with Kas, Frey's shenanigans with a hollow, and lastly getting the smack down with Angeni. Pretty sure these are before Angi's globaltrotting.
Explain what your power is, what/who it may affect, how it looks when used, what its limits/restrictions may be, and what all it can do.
The best thing, in my opinion, that you can do is think about what it looks like as a 'little' power-- one just discovered, and then think of what that little power turns into when your character has completely understood and mastered control of it and every use they can make of it.
Keeping it simple helps, and from there you can further customize it and make the evolution of your power cooler and cooler looking as you advance!