I would not rely on mangopuff for any sort of instruction. His intrinsic knowledge of game mechanics and reading people means that what he does is not something you can learn by just watching him. Additionally, he doesn't really do anything I would consider trademark mango other than be very aggressive (because he can). He generally just uses whatever he deems to be an effective move in the situation and it works.
Honestly, if you want to develop your own style, you need to stop watching other people play and figure out what works for you. Be pragmatic about it: try out new approaches, cross train with other characters to get a new perspective, nair more, wavedash more, try jabbing and dtilting people, there's still a lot of territory to cover.
Keep in mind that while HBox has developed a (very) successful style of play, it is most definitely not the only effective one. Dominant players do not get to the top by solely copying others, they all have to innovate and redefine the character in their own way.