User blog comment:Lamango/Unused Kaiju and Aliens from the Ultra series./@comment-31679215-20171218174744

I know this doesn't count as under Ultraman, but there were some unused Mirrorman and Jumborg Ace monsters who I only have the names for.

Mirrorman
Solomon King I and II, they were monster brothers.

Mirrorman was supposed to have a younger brother, but that never went through.

Jumborg Ace
There was meant to be another general after Demon Go-ne was killed off named the Fifth Executive. Some suits were made for him and his monsters, but Jumborg Ace's sponsor went bankrupt, causing the show to end early.

Among the unused Ace monsters were.
 * Nessie
 * Time Kong
 * Red Arrow
 * Whale #1
 * and Atlantic-5