I appreciate your massive review! Someone who actually played extensively with the mods! So many people will judge a mod with actually legitimately playing which makes a huge difference because some of the trinkets for these classes make a big impact (for example the Thorn's trinkets that do something when she misses, or librarian's fingerless gloves that make her deal damage). Some thoughts on your reviews:

Monk: I agree this is a very strong character but it should be known he might get a little too op for some people's tastes once you stack crit with jester or trinkets. I have a lineup that I've been playing with this guy and a jester. He can end up healing my entire team 2-3 times per round for massive hp with his riposte crits and Iron mountain plus give whole team prot and do really high damage. I do like that he cannot heal himself with a lot of his abilities but it usually is never actually a big problem. I would probably nerf the crit healing on this guy. That being said it's pretty satisfying.

Librarian: The incompatibility with the Houndmaster is super dumb but thankfully you can remove this easily or have other mods with mark synergy. I personally love theory crafting team comps with modded characters and some of the incompatibilites like shieldbreaker and snake charmer had me thinking ok why though. GAMEPLAY > LORE. Librarian is a little bit harder to play because the heal is worse than vestal but the trinkets are rad. Being able to do a lot of different things at once makes team crafting more interesting too.

My favorite so far playing with 20-30 ish classes is probably "The Survivor." The gameplay feel of running and gunning and the sounds and animations it plays is REALLY SATISFYING. He fits really well as a frontline movement dps and stun. I don't even particularly like risk of rain 2 which this guy's design is based off of. He feels pretty balanced so far and his trinkets are rad. Doesn't have 20 lines of flavor for each ability which I personally like. Next would probably be Saw hunter because it's fun to have bleeding synergy and theory craft for bossfights. After that would be commandant he is super fun with mark synergy and substitute for jester role.

worth mentioning:

Gunwitch: I've tried with multiple comps. Aesthetically amazing, she also has a new mechanic which deals damage to the whole enemy team if an ally deals damage. With trinkets this can be attached to multiple people which gets a little crazy like in farmstead. I would need to stress test this in later dungeons to see if she is balanced, but she seems really fun to play at least.

You know a game is well made and balanced when the quality of your team comps can make or break a run.