His grandfather, a general of the Astarian army, was killed by an Kim-Un-Kur bear anima, so he has a grudge against all Kim-Un-Kur. It was also the reason why he hated Senri because he was a Kim-Un-Kur bear anima.
He is also a childhood friend of Fly Greena, who often calls him his childish nickname "Iggy".
Igneous later wanted to combine forces with the Kim-Un- Kur tribe, but couldn't contact them because he was an Astarian. He got Senri and the others to come with him, which was also where they met Amurui.