Lennox - His semblance manifests in the ability to imitate another's semblance. So long as he see it he can understand it, and if he understands it he can imitate it. Generally, he remembers the semblances by remembering the person who it belonged to. Of course, one downfall to this is that the effects are less than the original user until he learns to properly utilize said skills and build himself up more.

^of course if you think that it is too OP I can change it. 

Rosalia - Her semblance manifests itself in incredible strength with grows the stronger she feels about something, whether it be anger, sadness, seriousness, the stronger she feels about something the stronger she will be with no realy upper limits as of yet. 

^I can change this one two if you think it's too op as well.