Curio is a comrade to Fury, Wrench and Poisandra as one of Sledge's generals, ranking lower than Fury but sharing the same standing as Wrench and Poisandra.
Luckyuro has no creature-creator relationship of with Aigaron; Luckyuro is an Earth native and was created, like all other Deboth members, from Deboth's cells.
Curio was crafted in a Frankenstein style from old and recycled monster parts by Wrench.
Luckyuro helps make the Debo Monsters grow with the Restoration Water.
Curio has nothing to do with growing the monsters, his only effective purpose being a companion to Poisandra; Sledge instead uses the Magna Beam from his ship to this end.
Luckyuro has a pouch which can store multiple objects.
Curio basically has no pouch.
Turned good by the end of the series.
Does not turn good. And was sucked by a black hole with the rest of Sledge's Crew. He is then finally blown up offscreen along with Fury, Wrench, Poisandra and Sledge when Koda leaves a bomb on the Warrior Dome.
Because the rangers traveled to the past to cause Sledge's ship to crash into the sun, Curio is erased from timeline.