You too actually bring up really good points. My line of thinking was what classes were most loved by the devs.
I can definitely see players loving Enchanters, shamans, and bards, a lot.
I love clerics too personally
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I also love a good warrior, pal, SK, mage, necro, as I have played a cleric, and druid a lot, and those guys are awesome to duo with.
As far as the players I like playing with the most? I would have to say, uhmm Necromancers are still awesome duo partners, also I play with myself a lot, because there aren't too many people to play with in zone at low levels on red. So I do love the necromancer class quite a bit. I am very grateful it's an in game option and I like the freedom it gives. Not so fond of the lore. There are other characters that can, like worship Erollisi Marr, like a mage I would probably want to play that more if it was a bit easier to do stuff alone towards the end game.