Ragnarok Online is some kooky Korean MMORPG with cute sprite art on simple 3D environments. It is grind heavy, class based, and filled with desirable hats.
They used to give out two-week trials if you had an email address, so my brother and I ended up with a lot of secondary email addresses, and eventually we ended up subscribing for a few months. Later we played on one of many semi-illicit 'private' servers for a while as well.
The environments were pretty with a water-colour styled look, and the character and monster sprites were cute across the board. My two mains were a thief with a raccoon theme (smokie hat, smokie pet, grey/brown dyes), and a holy spec'd lady Crusader with the helm and ear-wings. But I played all the the job level 1 classes and most of the second tier jobs.
It was a pretty shitty waste of time game with extremely rudimentery interface and GUI issues, most of the players were Korean, bots, dicks, or any combination of those three. The music varied wildy from cruddy to great.
All in all, it was not a good game in any meaningful way, but I still get nostelgic for it from time to time. Had some super-fun times with my brother, playing it all day all night some summer days when we were in the early years of highschool and not working.
A sequel seems to be stuck in development hell, and probably wouldn't be any good.