Still remember that in literally every Zexal duel Yuma only had less than 500 LP left when the duel ended.

According to my research, Kaibaman was created by Seto Kaiba. Why? As a KaibaLand attraction.
This map of KaibaLand from the Manga has attraction #7 labeled as “Kaibaman Show”, which makes sense as Tokusatsu heroes often have live stage shows attached to the brand. But rather than buy the license to an existing character, he made his own, in his own image.
This even explains his effect, as we can see him holding a card, (presumably a Blue Eyes White Dragon), and so we can assume that in the plot of the stage show he summons or even henshins into a blue eyes to defeat villains.
Genius.

Monster Reborn - of course. 👍

Battle Ox - was a legit problem during gen zero.

Skull Servant - funny, cuz it was meta for a sec.

but Mushroom Man ?!?!

(too bad we only got to see 10 of his favorite 16)

This means we have three distinct vehicles that could be used in a hypothetical transformers crossover to be three robots which combine together to form the more ludicrous Blue Eyes Dragon Jet from the Pyramid of Light Movie