For the wood box sprite you should make the boxes look like wood, not brown stone.
Overall, this make the game more strategizing. If deca adds some dungeons which highlight this character, then this character would be pretty darn cool. For now, I think it is a cool idea, but not too necessary. Recently, the game has been “who can deal the most damage” play style. The only good useful supporting classes are the pally and the priest. This however, can kinda be useful in some dungeons like shatts when you are turning of the switches. But, in other dungeons this class may be useless. I don’t know. this is just on paper. Gotta try it in the game first.