Chimera

Chimera (キメラ) is a minor character introduced in Shinyaku Toaru Majutsu no Index. He is a "bizarre magician", one of the magic gods who dwells in a territory beyond a certain layer of the world.

Etymology
In Greek mythology, a is a creature that is part lion, part goat and part snake or dragon. Its body is that of a lioness, a snake or dragon head is its tail, and a goat head pops out of its spine in the middle of its back. It also breaths fire. According to the myths, it was eventually slain by Bellerophon with the help of the winged horse Pegasus.

Appearance
While Chimera's appearance hasn't been described during an actual appearance by him, a fake version of him formed by Sample Shoggoth appears as a tall gentle-looking blond man person with fur attached to him like a lion's mane, horns and a snake.

Magic God Othinus Arc
They are mentioned in passing, alongside the Zombie girl, by Niang-Niang as one of the Majins present in the Hidden World with the rest of the true Gremlin.

St. Germain Arc
It is unknown where Chimera is when High Priest, Nephthys, and Niang-Niang decide to enter the world once again using Zombie's spell.

Magic God Invasion Arc
At some point around the time of the incident instigated by the High Priest, Chimera encountered Kamisato Kakeru and was 'exiled' by his World Rejecter.

Salome Arc
Chimera remains exiled, but his likeliness was used in a bluff by Kihara Yuiitsu while fighting Kamijou Touma, Salome and Misaka Mikoto, making use of Sample Shoggoth and an attenuated St. Germain virus to make imitations of the Magic Gods and their magic, to make them think she could draw out the Magic Gods and their power after stealing World Rejecter from Kamisato Kakeru.

Character Art Design
According to Haimura, there weren't any particular details focused on in the designs of Chimera and the Magic Gods whose appearances were shown for the first time through Yuiitsu's fabrications, given their lack of mention in the story, though Chimera was noted to be regrettably similar to a certain Asterios.