Context

Name: Kai

Type of bender: Fire bender and electric bender.

History: If there a moon spirit then there's have to be a dragon spirit. Blessed at birth by the dragon spirit at a young age his fire bending became more powerful than anyone's. He's is the son of the fire lord, now traveling to republic city to find an adventure of an life time.

Techniques:

spinjitzu

Later on in the series: Elemental Dragon

Natsu: Flame techniques

Love interest

Asami

Korra