I don't think you need that many characters If your gonna main Wario.
Wario is great against EVERYONE except: olimar (fking annoying) diddy kong,
Falco, marth and G&W--hes even with snake, MK (still hard tho) and DDD.
If you use Snake as well, that takes care of diddy kong, G&W and Marth. and your even with falco.
Wolf takes care of Olimar.
There really isnt any reason to use ZSS, shes hard to learn and has a lot of bad matchups, I only use her and toon link to cover my bad matchups.
If you wanna go SUPER cheesy, you can just do Wario and MK, MK has no matchups, as he is the broken charactor of this fighting game.
Reason I say this is that, The more charactors you use, the harder it is to remember how to play against everyone and each tactic you need to use.
It makes things a lot more complicated and can fk you up.
I use ZSS to cover MK, Snake, and working on marth cause I can only play with charactors I like.
And use toon link to stop diddy.