Because they left stuff out. So post something here if you find it on online ^^:
Character Profiles (credit to Exorcists Order - Wikipedia has the link ^^)
Rabi Official Profile
Mixed race (18 years old)
Height: 177 cm
Weight: 68 kg
Birthday: August 10th (Leo)
Blood type: O
Ravi is not from D.G. but the main character of a completely different story I had in mind, “BOOK-MAN”. He’s quite is a likeable character, so I’m really glad he joined the cast. As the successor to the Bookman, who is the keeper of the hidden history, Ravi will become an important key in the D.G. story too. By the way, the reason why Ravi wears an eye patch over his right eye will be revealed in the series (provided the series continues that long). Please wait for it.
Bookman Official Profile
Mixed race (88 years old)
Height: 140 cm (not including his hair)
Weight: 38 kg
Birthday: August 5th (Leo)
Blood type: A
This old gentleman was originally a character I thought up for another manga. Among all the D.G. characters, he is the easiest to draw so I like him. (Hey!) All the many secrets attached to the existance of a “Bookman” is something I will gradually come to reveal, I think. By the way, the dark circles around his eyes are make-up.
Crow-chan Official Profile (okay, Aleister Crowley)
Romanian (28 years old)
Birthday: 1st December
Blood type: AB
I’ve always wanted a vampire sort of man to become an Exorcist, so Crowley’s character design was decided from the very beginning. His personality was decided later. For the Vampire in the Secluded Castle story, the scene where they were digging up the graveyard, the scene where he bit the woman (AKUMA) he loved to death, were scenes I’ve always wanted to draw. (Oi.) By the way, Crowley’s image model is Yuusuke Santamaria.
Tiki Mikk Official Profile
Portuguese (26 years old, maybe)
Blood type: O
He’s like a big brother who loves both his human and Noah sides. I wanted to draw a handsome-looking Noah, like Beckham, so that’s him. I really enjoy drawing him.
The novels are written as a collaboration with Hoshino-sensei, so they *do* provide actual background information on the characters (so take what they say as true).
-Allen refuses to touch anything with alcohol due to an incident with Cross. After training, he accidentally found some of his master's alcoholic-laced chocolates and ate them. Cross went berserk and punished him so harshly that Allen promised him that he would never touch alcohol ever again. Information from Vol. 7 Talk Room.
-According to the Volume 7 Talk Room, Lavi has an interest in girls whose age range from ten to forty, including Lenalee.
-Kanda's name is a "hand-me-down" from an earlier manga draft, which got rejected. The manga-ka liked the name and kept it. Information from Vol. 8 Talk Room.
Bak is 168cm, 53kg, and born on 11/11. His blood type is A. (I can't read any of the other information... T_T)