or the person should not complain or the person should not play the gameif it's a dating sim then yea it's easy for the dev to make characters you're not interested to skippable.
but for a story-driven game, it's A Nightmare to do it.
next time you talk to him, tell him the best way to remove Alex from the game is to go to windows Folder, find System32 folder, highlighted it, then press control+Shift+Delete, if a warning window popup, just tell him to ignore it and press continue.
this will remove Alex from the game and replace her with a secret loli character. he's gonna LOVE IT!
(for anyone reading this. please don't try this at home, unless you want to destroy your Windows )
ALEX IS MY FAV CHARACTER in this game