The first BCX/Brawlhalla World Championship champion was Boomie , who won the inaugural 2016 event. That first title is the one most people mean when they ask about the first Brawlhalla champion.

Quick note

If by “BSX” you meant a different Brawlhalla event or series, the name doesn’t match the main championship term used for the game’s world finals, which is BCX.