DPS
DPS is needed for raid to kill the boss faster as the boss gets stronger as time goes by. Every team should have at least 1 dps that can deal decent damage and that dps should preferably be able to apply debuffs as well.
Recommended DPS
1) Hwa
Hwa is just so great for raids. Attack slow on first skill, plus he can decrease the attack bar of you head which allow you to get more turns to apply debuff/heal. Hwa should be runed with spd so that he can go as fast as possible to land debuff and decrease the boss's attack bar. Her 1st skill also scales off speed. She also has a good leader skill that can be used for raids. (19% crit rate)
2) Fire Monkey
Probably the king of raids. Great leader skill (33% defence) with a passive that is as if it was designed for raids. Provides armour break on 2nd skill as well and has great base stats to either tank the frontline or be a backline damage dealer.
3) Wind Monkey
While his fire brother is the best for raids in my opinion, wind monkey is no where far from him. Good leader skill (33% hp) with a passive that can protect himself as well as deal more damage to the boss through his revenge procs from his passive. Also has an armour break on his 2nd skill which is good for raids.
4) Theomars
Theo being theo, does great damage to the boss. He has a good leader skill (24% crit rate) and has his passive which helps in survivability. He also provides armour break on his 2nd skill.
5) Seara
Seara is great anywhere. Including raids. She provides a great leader skill (24% speed) as well as providing bomb debuffs and dealing great damage to the boss with bombs and promised time.
7) Copper
Copper was recently buffed and I like his kit now. He can provide attack slow on 1st skill, if boss is under armour break which he normally will be. He can armour break on 2nd and he can deal huge damage on his 3rd if he crits and the boss is under armour break or he has armour buff so he can ignore defence.
He can also tank the front line if you give him a bit more hp subs.
8) Wind/Dark Magical Archers
They deal great damage, provide attack down debuff on their first skill. Wind magical archer has a great passive, dark magical archer has attack slow on his 2nd skill and chance to ignore defence skill on 3rd.
9) Dark/Wind Vampire
Self sustain first skill which has life drain, 2nd skill has attack down and attack slow. For wind vampire, 3rd skill deals great damage if there are more debuffs. For dark vampire, he has a good passive which will land branding.
10) Camilla
Great passive which ensures survivability, deals decent damage on the boss and has attack slow on 2nd skill.
11) Water/Wind/Dark Lich
Slow debuff on 1st skill, armour break on 2nd. Wind lich has a passive to sustain himself with a shield, water lich has a immunity against freeze and stuns effect which is good when the raid boss does rageful roar. Dark Lich has a damage reduction effect on himself. All 3 liches does decent damage.
There are other dps which are still usable but less commonly seen. If you have any question on dps feel free to comment and ask if those monsters will work. But the rule of thumb is as long as that monster provides a good lead, or brings debuffs, or can tank and deal damage etc he should be usable.