Thats some classic anime, well done
this stuff had alot of work in it,for an animation i give 10
but if you plan to make it an intro for some serie project i may suggest something,
your intro dont suggest much about the villains in your story, and making it some mystery may be good, but it could be nice if you would shown your char punching some villain's minions or underling, wich would give a hook about how the aventure will developp into, see there is nothing bad into sprinkling a little clue or lead about how things are going to develop in a story, it keep the watchers hooked
so for the intro design i give a 6/10, because it look more like a character parade than an intro of heroes confronted to a great villain( or villains) with some plot , and suspense, soo keep working, we want to see more villains...show us some evel badasses so we dream of seeing em Wtfpwned by the heroes each episodes :D