His design and fighting style don't look very creative. I'll give him a chance since it was just an initial reveal but he just looks way too unoriginal that I doubt there's more to him...
I think it’s quite too early to say he lacks originality and personality in his fighting style when we only saw a trailer and gameplay where the player only used like 5 moves.
In terms of design almost nothing is original these days, everything has been done before. Diego is quite original compared to the DOA cast and will serve as a great replacement of Leon.