Who was supposed to be in Soul Calibur III according to reports, which led to the removal of Kilik's red coat. Reasonings for his removal from the character cast are unknown though.
Continuing the topic of possible guest characters in SC: according to some rumors Bayonetta should have been in the SC5, but for whatever reason she was excluded. It is not confirmed for sure, but there were found several files on the disk, suggesting that there were supposed to be two guest characters. However, it is impossible to confirm, who was the second one.
I played only in Soul Edge / Blade, SC1, and SC3. My favorite is Soul Edge / Blade. I consider this game to be the best 3D fighting game ever, alongside with MK Deadly Alliance. Flawless combination of music, different characters, arenas and atmosphere. Also it had wonderfull single player training / adventure mode.