The Ratio system
Owing to the many years of a solidified "top tier" meta in competitive MVC2 centered around extremely strong teams an alternative set of rules for team building has risen known as "ratios" and perhaps inspired after Capcom vs SNK 2's implementation of this concept. In general it works like this: Each player has a point budget they may spend on the team of 3 characters to select before gameplay. Strong characters cost the most points (generally to avoid 3 of the best characters in the game being on the same team) while weaker characters cost less points usually divided by cost groups.