Kurasuniigo of the 5000°C is the main antagonist for episode 10 of the 2010 TV series Tensou Sentai Goseiger. He is a weevil-themed alien who works for the Universal Annihilation Army Warstar.
He was voiced by Tomoaki Maeno, who later voiced the Gunjoji twins in the 2019 TV series Kishiryu Sentai Ryusoulger and both the Bonn World and the Great Bonn World in 2021 TV series called Kikai Sentai Zenkaiger.
Some time before Dereputa destroyed the Heaven Tower, Kurasuniigo decided to act on his own and attacked the Goseigers. He targeted Hyde as he protected the ocean, but his elder Magis appears to try and rescue him. Through a sacrificial attack, Magis attacks Kurasuniigo and throws him into the ocean as he dies.
However, Kurasuniigo managed to survive and reemerged from the water to resume his mission. When Hyde discovers Kurasuniigo's return, he immediately attacks him out of vengeance over Magis' death, but ends up throwing off the Goseiger's battle abilities and thus allows for the Warstar Insect to escape.
After rediscovering his own purpose to protect the ocean by way of an ichthyologist friend of Professor Amachi, Hyde becomes rededicated to his mission and calmly and coordinately works to fight and ultimately defeat Kurasuniigo, stunning him with the Seaick Bowgun before the team destroys him with the Gosei Buster. After Buredoran revives him, he is made quick work with Seaick Gosei Great.