Maybe ragnarok origin? I played it with my friend and we named ourselves their online namesjistar and neuta LOL it’s relatively the same there’s battle and player interaction
It genuinely looks like Maple Story. The first one, not the second. Even the name of the classes, the items and the game system. The "chibi" characters and customization yadda yadda... It all points to that one! I'm not sure about the old game that Neuta played tho... Mabinogi maybe?
Is there a game similar to what they’re playing? Looks fun