His real name is Coatl tletl lived in Mexico City until he met Shiro and decided to go with them for adventures and girls, since one of its disadvantages is to be a casanova with every girl he meets and fall madly in love them.
For those who ask his name means, coatl: is snake in Nahuatl, and tletl: fire is also the Nahuatl, that means fire serpent in Nahuatl