Cool, but it's not like we got a lot to work with here, with just class names.
Druids being shapeshifters is also a D&D influence, iirc.
When in doubt, start with an archetype and see if you can make it your own.
kung fu monks don't belong in a western fantasy setting.
Well, in this exact flavor, probably not. But it's not like the idea of a spiritual martial artist is completely foreign.
Say, something like a flagelant or that bald guy who is called on by the church to solve problems.
Mind dominating over matter and force of will taken to the ridiculous extreme is what springs to my mind when I'm thinking about this.
And when it comes to unarmed martial arts, just look up pankration. People tend to wank over weeb shite,
but it's not like the idea of becoming a weapon instead of wielding it is something that wasn't tried in the west.
Might be good to have monks somewhat related to priests, part of the same organization but with different responsibilities.
Priests answer the higher calling, monks are more down to earth. The former chant and preach, the latter do manual labor and don't shy away from a beating.
As for Druid, it seems to overlap too heavily with the Elementalist
The point, I think, is to tie the spells with natural phenomena, so lightning strikes, gusts of wind, pouring rain are all fair game.
Fire would be tricky to justify (though you could argue that wildfires are something that's natural), so elementalists can have that.
Other than this, the spells could focus on manipulating all sorts of plant life. Have a tree grow big, make it grow thorns then animate it.
Poison is another thing that could set the druid apart from other spellcasters.
If you don't want anything D&D inspired, try Asterix. The druid would then be in charge of preparing all kinds of magical brews.