Ranker but even if they're not, you should be fine.
Angels - I don't advice to do more than 1-2 at the same time and always with a bathory on because of the dark gc [always careful with them, they do good damage and can kill you before you notice]
Undeads - bathory on because of that hp steal skill [if you mob, having mobs spamming it can kill you]. Green pots may also help you.
Golems - pasana on, joke to do 3-5 at the same time [they're a joke]
Ghosts - joke since <60% hp means heal spam but if you mob too much and you lack damage, their heal spam > your killing rate and you end on a loop where nothing dies
If you need more damage you can always alt some characters at the map at the same party. Depending on the server setup, you may only need to have them in the map death at the same party.
If you've trouble doing everything, just stick to the ghosts since they're easy to do and probably the ones who will make you profit.