Krynxe
I can't pronounce it either
It is, in my opinion, a mixture of considering all of their matchups (while minimizing deviations) while also considering all of their positive and negative attributes. The thing is, their "positive attributes" are all relative to the other characters as well. Olimar's grab range wouldn't be as great of an attribute if everyone else had it OR had an easy way to deal with it - same goes for any positive/negative attribute for any character.