セン

The evil rival of Koma reincarnated as a dog. Was found by Kyou one day and lost all of its memories of after being defeated in first game. Is opposite of Koma in that she only seems to like Souma.

Influenced by Kyou hence took shape of a dog like Koma and no longer evil due to Kyou good nature. Also likes Souma because Kyou likes Souma.
Both deities power and nature influenced by followers, because no one believes in them anymore they lost most of their power. And because only Kyou and Souma believe Sen as good person she is able to overcome evil nature.