Ahh, good old science-fiction (Sci-fi for short), who doesn't enjoy that? This category includes any MBs, who are from the well-known science-fiction genre, a fictional work that is based (or tries to be) scientifically possible worlds or settings without the use of fantastical elements such as magic or the supernatural (although these two can coexist in some cases). However, as time goes by, more unique things have come with it and still is ongoing.

Basically, any MB who is from any form of sci-fi or its subgenre of such, can and will count there, be they normal human, humanoid, machines to aliens, hyper-evolved organisms and anything else in between.