So is that Joker's canon name in the manga or something? Personally, I think Joker sounds a lot cooler, but I'm usually against MCs having canon names anyways.
Joker is the canon code name while Akira Kurusu is a play on words. Its a filler name for the manga (and will probably change if there's an anime adaptation), it roughly means Intelligent Diplomat, which kinda fits the P5 MC in an ironic way.
