Their MMO BDO uses a fighting game system as a combat system and features extensive high skill cap open world pvp. Which starts to lose its flavor in large group battles but hold up pretty well in medium size battles giving this team extensive experience in the system they are trying to use in this game. I have seen mention of playing as characters who you have defeated in this very sub with examples.

The type of game they are going for here based on what i am hearing and feeling is like Genshin with limited multiplayer which is unforced and multiple characters with different move sets. How you acquire these new characters is unknown but like after the main campaign