Here's something I never expected: KOS-MOS and Shion (Albedo as well, but I found no proof) from Xenosaga appear in a Japan exclusive series of baseball games called "Famista" made Namco. This is such an obscure fact that I had trouble even finding proof. I cannot believe this.
They're apparently featured on a Namco team called "Namco Stars" alongside characters like Jin from Tekken, Klonoa Pac-Man! Here's more WEIRD XENOSAGA BASEBALL ART.
I found most of my information from this thread from a few years ago that confirmed all my suspicions by @wadasaza https://twitter.com/wadasaza/status/958243600940216320