Roberto's parents were a reptilian demon and a farm woman, and unlike Diablete he was raised by both parents. He's a lot quieter than most other demons, and he tends to indulge others a fair bit. He does not really enjoy the awe he receives from cults who believe that half demons are blessed beings, but he's learned that you can't really convince them otherwise so he just tries to do what will make them happy.

Roberto, unlike most half demons, does actual work in exchange for money. He has done some construction work, some forge work, and quite a fair bit of heavy lifting. He has a charm which he keeps hidden under his shirt that allows only half-demons or demons to see his true appearance (but when you show up in an area where they have detectors for demonic presences, it doesn't really help).

Roberto has two built in forms of self defense in the shape of the 'needles' in his fingertips, and then the spines on his back. He can channel his poison into them at will, but the poison that comes from his fingertips is much more potent. The spines on his back can lay flat or rise to rattle when he's agitated.

The bioluminescence on him works differently between his face and back. On his face it fades slowly from one colour to the other, but on his back it ripples down it like it would on a comb jellyfish.

Roberto was sort of bullied into helping Diablete, seeing as he's nice, he's bigger, and he's strong as well and has his poison abilities. So now the two are attempting to find out WHY certain groups are so set on the annihilation of half demons.