With all the Tsubasa Tokyo Revelations love going around /cm/, I can't help noticing the lack of Kamui, Fuuma, and Subaru. (Does /cm/ hate X?) There is also a sad and pathetic lack on my hard drive, but here's something google gave up.And feel free to throw in some Seichirou, if you have it.
Actually, most of the X cast makes at least cameos in TRC, but the Tokyo arc just brings most of 'em together.