Do you mean special abilities or stats?

If stats, for me, physical and mental must be equal to quality for all outfield players. Players in the MC row must be evenly balanced, AMs slightly tilted towards attacking, STs very attacking, but not too much as well. Same in the other way from MCs, slightly defensive for DMs and fullbacks, and more defensive for DCs. GKs are confusing, but I focus on defence, physical and mental slightly behind their quality level.

I don't care about special abilities.