User blog comment:ClopssNoChikaraa/Inazuma Eleven GO Shine / Dark - Discussion/@comment-82.244.221.45-20120107152409/@comment-4703969-20120107155719

Basically, there's a few scenes in the game with Tsurugi talking to Hakuryuu. (I'm not sure what happens in Dark, but I'm assuming it has something to do with Tenma and Shuu)

They weren't introduced in cutscenes like the Ogre, I'm assuming it's because Level 5 put most of their budget into the anime hence not having that many cutscenes, and the cutscene quality got really bad further into the game.

I'm not too into the Movie's plot, but judging from the Unlimited Shining match, Gouenji had nothing to do with it. They work for Kibayama and Gojou (Teikoku DF).

I'm not sure where they come from, but I'm assuming they're spirits and are 1000 years old. (According to the wiki).