Even though I watch finish the anime, I didn't know much about his statistics...

Name: Zelgadiss Graywords

Age: 18 years old

Blood type: AB

Race/Species: Zel was a human but was transformed by Rezo the Red Priest into a chimera (a mixture of different species of animals). He's 1/3 golem, 1/3 demon, 1/3 human.

Place of birth: Unknown

Relatives: He mention that Rezo the Red priest is both his grandfather and great grandfather (I dunno how...)

Abilities: He has a wide knowledge of spells but is good at sharmist spells. Also, he's quite a good swordsman.

Body: Due to the fact that he's 1/3 golem, he has a body made of rock and hair made of steel ( malleable one ). This serves to him as a natural armour from swords (except the sword of light [hikari no ken]) and normal weapons (even bullets). But not magic.
          He can also run very fast and is very strong too.

His wish: To turn himself back into a human even though everyone commented that he is very handsome as he hated his appearance.

Hair colour: Blue

Skin colour: Blue

Height: 175cm (??)

Weight: Dunno... how much does a big piece of walking stone weighs? *giggles*

Seiyuu: Midorikawa Hikaru
 

What I think of him:

        Zelgadiss the blue man is really cute. He's a poor thing having to lead his life in misery as he did not like his looks and had to keep on looking for cures. Worse still, he tends to wears a cloak and avoids large cities due to his appearance. However, I'm glad that he got to know Lina Inverse and the rest and they made him open up a bit more. He's the most serious and smart guy in the show and it is really funny when they crack harmless jokes on him. You should see his reaction. Also he had funny ways to look for cures too.

        Also, he's a very reliable and trustworthy friend to have. He wouldn't really mind what you do to him once you're his real friend and he'll be prepared to lay his life down for you. He got cool looks too.