I need ideas for some OCs I have so far

Lyla=red headed girl found on the streets and was a assassin for money,ultimate samurai or element of what?

Dj: jays younger brother,element of water..maybe? Or is ice too similar...daanngiit it's so hard!

Emma: element of love, falls in love with jay backstory: lived in a house with a loving family till....lyla kills them!!! ( you know cuz she was an assassin....ya) so enemies for life...ya.