|This article is about a/an monster in Engine Sentai Go-Onger.|
Water Pollution Prince Nigorl zo Arelunbra (害水王子ニゴール・ゾ・アレルンブラ Gaisui Ōji Nigōru zo Arerunbura): Prince of the Arelunbra, a fencing master of the Nigorl Rapier (ニゴールレイピア, Nigōru Reipia) and able to summon rain clouds.
A long time ago,way before the Gaiark came to power,the Arelunbra family, a prominent Water Pollution clan, attempted a conquest of Machine World, lead by Prince Nigorl and Uzumaquixote as his right-hand man. For some reason, a portal opened up, sending both fighters to the Human World. This event quickly put an end to the battle.The clean air on earth turned the both fighters into statues; Nigorl eventually being buried under a mountain.
Nigorl ended up on Earth in suspended animation after Kegalesia turns him down, due to the fact that he has an unusual liking to things he considers beautiful which contradicts the Gaiark's taboo on the word "beauty." Though revived, Nigorl's affections turn from Kegalesia to Engine Bear RV as he attempts to marry her. But after the team regains Bear RV from him, Nigorl is mortally wounded and left to die by Kegalesia.
While fighting, Nigorl's stronger ability is the Water Pollution branch's trademark Water Pollution Fusion, using it on Kegalesia and mass amounts of water to enlarge into a giant without need of Bikkurium and having Kegalesia interfaced in his systems as a battery to increase his power. In this state, referred as Mix Kegalegorl (ミックス・ケガレゴール, Mikkusu Kegaregōru), Nigorl's attacks are Kegalegorl BeBeBeBeam (ケガレゴール・ビビビビーム, Kegaregōru Bibibibīmu) and Kegalegorl ThunThuThunder (ケガレゴール・サンササンダー, Kegaregōru Sansasandā). His name is from the Japanese word for "to get impure" (濁る, nigoru).
- Height: 209 cm (52.5 m: giant)
- Weight: 222 kg (610.5 t: giant)