Fanfiction Crossover Idea

There's a minor character in the novel whom I've written a fragmented backstory from. He hacks the government regulated Tech that makes magic available to the masses, and develops a way to cast spells from within Constructed Reality. I was thinking it'd be fun to write some stories with him meeting up with digital versions of favourite characters from Scifi/Fantasy.

I'm learning toward starting with the 11th Doctor from Doctor Who.

If anyone has a request for fanfiction crossover to my universe, please leave it in the comment section.