I don't understand the whole thing about not maining Lucario because of Azen? Anyway, you should main them both! Personally I main Pikachu and Meta Knight, so with them, I use each whenever a matchup comes that favors one over the other, and it works pretty well, much like counterpicking stages, except for characters. Practice with them both; get your ability to play each how they are meant to be played, and thus, how you play each should vary from the other. You said that you're friends said you played pikachu poorly, but you fixed those problems with TL, well just change pikachu, don't completely drop it for that reason...that's just silly! anyway, do what's more fun for you if you desperately need to have ONE main; if not, look at Bunny-she has like 50 mains, and there are only like 35 characters xD