https://www.logres-jrpg.com/

It's a mobile online RPG with pretty heavy co-op requirement. You can freely join other people's battles, have a party, etc. There are several different classes, which you can be all of them instead of just selecting one. Diamonds (premium currency) seems pretty easy to get and isn't hardcore p2w. Pull rates for weapons is very generous. It plays similar to a traditional MMO with tanks, DPS, and healers. Very easy to level currently but I suspect it to change soon.