focus on one character, but play others occasionally to learn their weaknesses and learn general things about the game. when i started melee i played sheik because she took very little techskill, yet i had to mindgame with her to win which made me a better player. once i became a smarter player, i had to work on my techskill so i played falco. i never planned to go pro with either of these characters; they were just tools in the grand scheme of making me a good falcon player.
as for actually competing with more than one character, i don't agree. aside from being a very desirable teams partner, you'll find that switching between characters in singles is gimmicky and banks on the opponent being significantly worse at one of the matchups you present them with. i don't think any of the current top pros have any glaringly bad matchups, especially not versus watered down characters (since you'll be playing more than 1 character at once, your individual characters won't be at their full potential).
I totally agree. I do think it's gimmicky.
In general I find that if someone plays multiple characters that's cool, but I don't find it particularly impressive. Once you're good at the game it's not very difficult to translate the skills across characters, especially good characters. Maybe if the person is formidable in tourney with multiple harder or unconventional characters like Ganon or Peach who obviously take a ton of time and effort to become good with. But like, someone who can play sheik + fox + falco in tournament is not anymore impressive than someone who can play only peach or something as far as I'm concerned. The best characters are super easy to pick up and become at least respectable with without putting in a ton of effort to learn them.
I'm much more interested in a person who pushes a single character to a unique level or to a point where they have a unique style and do much more than just the generic standard stuff that average players will do with the character (like say stomp knee or nair up air knee with falcon or something).
Plus people who have multiple characters like that will basically at all times be playing even or better matchups if they choose to. Honestly, I think it would take me very little time to learn how to play fox vs sheik to the point where my fox rivals my marth in terms of how it fairs against sheik, but **** that. :D
I don't mean to knock people who play multiple chars I don't find them less impressive just not EXTRA impressive.