I like to define my character as I play, so I prefer an inital blank slate that becomes its own unique character as I play , just like in many role playing games. See all the unique Guens in the Genevieve WIP for a good example of this.
Almost every game has a defined MC, so I’d only play a defined MC in visual novels or games, since images would restrict the creative character design and character builders are kinda hard to code and design. Text games should be unique and show more customization and avoid defined MCs.