[quote=@Shard]
[@Fallenreaper]

I didn't specify that, my apologies. 

Powers show up early, and just continue to develop through a mutant's life. Considering how every mutant born is obviously a mutant, there is no 'surprise reveal' when their powers happen to go haywire. So, their powers start out when they're little kids, to no one's surprise. 
[/quote]

I had to ask because X-Men mutants can have big or small outbursts for their powers and can leave some big aftermath. For example, depending on what's possible my firebug can catch her house on fire or just singe a blanket. So I wanted to be sure what was more possible for this world. I guess this means their appearances hints to their abilities?