These are characters that are never seen in the series, but are made reference to in the anime/manga, or some other way

“Booby is a female Majin spawn created by Majin Buu in a quest to find a lover. In Age 790, Buu...

Booby

“Baby Buu (official name still pending) is the first child of Majin Buu and Booby, who was...

Baby Buu

Katas

“Videl's mother is the ex-wife of Mr. Satan and the mother of Videl.[1] She is never seen in the...

Videl's mother

“Future King Cold is the alternate future version of King Cold. In the alternate future...

Future King Cold

“Trunks is Ranfan's unseen husband.[2] Ranfan's husband is never mentioned in the original Dragon...

Trunks (Ranfan's husband)

Burter's mother

“Immortal Phoenix is an unseen pet bird kept by Master Roshi, allegedly capable of granting...

Immortal Phoenix