TL;DR, the Psylocke we play as in MR is not Betsy Braddock. She's Sai, a feudal japan ninja who's been ripped from her timeline and is fighting to get back home.

@Danes Psylocke's biography in Marvel Rivals states:
A wandering warrior in feudal Japan, the telepathic ninja known as Sai has devoted herself to striking down ancient demons and monsters. With her wolf Logan by her side, Psylocke won't rest until all Yokai have fallen by her psychic blade.

Sai was ripped from her reality by the Timestream Entanglement and put on display by the Collector. Alongside newfound allies, she escaped her cage and learned that other familiar warriors might still be out there. Her new quest is to gather those heroes, end this conflict, and return home.

So, super nerd "actually" comment here. But how/why is she speaking Japanese? Betsy is from Essex, England and should have an upper-class posh British accent.

Thank you very much!