Wakfu is really fascinating to me because the whole thing is based on a French MMO from the early 2000's and the first season is like an all-time top 10 adventure show for children with great individual episodes, a fantastic overarching villain, cool story and lore, etc. Then with each progressive season it gets a bit more actiony, greater focus on romance (even a bit risque in some places) and I would say Season 4 is pretty much aimed at adults. And one of the only foreign language shows I watch that isn't Japanese (still watch subtitled, tho).