Soulcalibur Bonus Characters Who Should be Promoted to Full Mainline Status in the Future
Soulcalibur titles II through IV featured special characters known as "Bonus Characters" who would act as mooks in various modes and could be unlocked to use in other modes. To date only one Bonus Character has ever been promoted to being a main roster character, Amy Sorel in Soulcalibur III: Arcade Edition (and while some may also include Hwang and Li Long, but they were pre-existing playable characters from prior installments). Though with the timeline reboot via Soulcalibur VI, hopefully some of these Bonus characters will be revamped as well.
I doing this in ascending order with most wanted at top and least wanted at bottom.
Also a note on characters who were originally featured in SC III's Chronicles of the Sword mode (Abelia, Luna, Demuth, Aurelia, Chester, Strife, and Girardot). Yes I'm well aware that they were not from the same universe as the SC's (and thus officially non-canon), but the fact that parallel universes have been established now via Soulcalibur VI (with Zasalamel's comment on Geralt of Rivia's appearance being used as a way to justify this), it is safe to say that will also be used to justify the COTS characters appearance should they return in the future.
Some honorable mentions should be given to Lizardman Mook (from Soulcalibur II) and Greed due to there being no individual articles for them as of the this posting.