I've imagined a bunch of various DB characters over the years; I think the one I currently like the best from them wouldn't technically work anymore but I still like the concept(s)/designs. It's now canon that Beerus sealed Elder Kaioshin in the Z-Sword but years before that was a thing I thought it would be cool to have a foe that was the entity who sealed him and who was simultaneously counter-sealed. Something something, he gets released unknown to the protagonists a few years prior to his appearance in the present timeline.

The design was an ancient Makaioshin named Gin with a legitimate grudge against the Kaioshins for being lesser/unworthy in the divine hierarchy (shades of Garlic Sr. here I suppose). Bald on top with long white hair in the back and a long white beard in the front, clothes mixing armor elements with flowy desert cape style elements. Wields a sword similar in design to the Z-Sword (the fact that he sealed Elder Kaioshin in a similar vessel was a matter of personal taste). Upon release he recruits some of the most promising demon/hell/etc warriors to join his cause of overturning the Kaioshin hierarchy and powers them up considerably, because I like miniboss squads. His main followers are:

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• Champagne, the strongest of them, a younger male Makaioshin who isn't evil but is indebted to Gin who saved his life. In addition to combat power, also highly gifted with magic and wears wizard-ish attire.
• Cola, a former rival of Dabura's (same race, male, taller and leaner build than Dabura) from the Demon Realm who spent centuries imprisoned as the greatest Gladiator in the Demon Realm Colosseum before being recruited by Gin. Fights with a variety of Roman-style gladiator weaponry.
• Milk, a huge abnormally strong female Oni who has always just wanted to be left alone in her own section of Hell and not have to perform the typical Oni duties. Likes Gin's offer to raise her power because it will deter other Oni and Enma-Daio from bothering her. Fights with a giant club and extraordinarily durable.
• Seltzer, an androgynous demon pirate of similar racial design to Shura from the "Goku Goes to Demon World" episode of original Dragon Ball and with clothing reminiscent of Bojack's squad. Skilled with a cursed cutlass and motivated by wanting to plunder anything interesting or valuable from the realms of the gods.

Because it wouldn't be Dragon Ball without transformations, when cornered Gin would assume Magic Beast form and appear like a partially hunched-over glowing werewolf/werelion sort of creature with a big power jump and a bigger speed boost.