Grad is the Blue Dragon Shadow revered and feared for its Flamme Bleue. Knowing nothing of the human world, Grad entered Ral's shadow when he was still a baby, hearing how human young made such great hosts. This was in preparation for his quests to kill the Queen of Darkness, Bira, for trespassing onto the human realm and subjugating his fellow Shadow to her desires only and ruining his home, Le Noir. And thanks to Ral, Grad is able to survive in the human's world of light and fight the Shadows in the human world. However, once Le Noir was restored, Grad returned to his home along with Ral due to unique circumstances.
Aia's chameleon-like shadow partner. He can stretch his shadow up to sixty "machirs" and doesn't make a sound when he walks. Aia also claims he likes it when she pulls his tongue.
Although Shuu appears to be playful, he is actually very sensitive. He was the first one who realized that Chitoge and Ichijou were not actually dating. Also, he was the only one who seemed to realize that Tsugumi was a girl, though he hid the thought and decided to play along just for his own amusement. Also, it should be noted that Shuu is the kind of person that would do almost anything for a laugh. He is the best friend of Raku Ichijou. He is in love with his English teacher, Kyoko. He confesses just before her departure for her wedding.
God of mischief (and in some versions chaos) in Norse mythology. Trapped in the body of a child, he seeks a way back to the realm of the gods and his original body. He is the father of Fenrir, Yamino, and Hel. He has red-brown hair and green eyes; he also has an aversion to deep water as well as a possibly small case of amaxophobia since he seems to hate riding in cars. Loki has many romantic interests. Loki is more wild and silly in the manga than he is in the anime. (Source: Wikipedia) He seems to care a lot for Mayura (possibly, he loves her).
The original Lola is a female pirate who is the captain of the Rolling Pirates. She is a member of a group of Moria's victims who have banded together, the Thriller Bark Victim's Association. (Source: One Piece Wikia)
The younger twin sister of Roll. Like her sister, she works as an assistant at the Photon Power Lab and also pilots Million Alpha, one of the three robots in the Robot Corps/Mazinger Corps.
An Eastern Bloc agent who was invited to the haunted castle along with Odin and Freya. He is always calm, cool, and collected, and is never fazed, no matter what happens right in front of him. With his sharp mind and uncommonly good physical abilities, you could call him "the 009-1 of the Eastern Bloc."