Geddoe is one of the three protagonists of Suikoden III, which is a reasonably well-known series of games in Japan; Geddoe's game in particular came out in 2002, and was also later adapted into a 11-volume manga. I am perfectly fine with him being recognized, and the idea of multiple/parallel worlds isn't completely foreign to him, though he might "...." at you if you try to tell him he's from a videogame. XD

Sion is from a series of Japanese light novels called The Legend of the Legendary Heroes that started in 2002 and runs in Dragon Magazine (home of several notable series such as Slayers and Scrapped Princess) and was adapted into an anime that aired in the second half of 2010. There's also a couple various manga adaptations. I am perfectly fine with Sion being recognized, as is Ryner (tearsofademon) who is also from the same canon!