User blog comment:AmazingPST"Providence"/Profs Speculation 01: Great 8/@comment-26245817-20150411042702

Ok so if Drum get powered up by tenbu (fire) here is my idea for the others

Water:  Zanya (And he goes to a water ninja deck)

Earth: Tetsuya (He has ROCK and roll based cards in his deck in a few cases)

Wind:  Wind (Sorry for bad pun using her nickname >.<,  but maybe blade wing can get a hurricane form?)