assuming i don't want to copy and paste the meta teams, what kind of mindset should i have when building a team for pvp?

offensively:
1. make it varied so i can kill everything with ease
2. invest in 1 color so i can take advantage of various bonuses as well as finish off specific enemies quickly
3. invest in one color but have a girl or 2 with backup color for that one color offensive weaknesses

defesnvily
1. make varied colors, so my all team won't be taken out by a single AoE
2. make a single color, so teams who don'tr have an attacker specificly for that color (or if i taken out said attacker early on) will not have easy time on my team
3. not worry about it, its my tank job to deal with enemy attacks
4. have 2 tanks of different colors but the other girls can be whatever