Riser Phenex

Riser Phoenix is the third son of the Phoenix clan. The main antagonist of Volume 2 of the novels, he is Rias' fiancé who has inherited the powers of the immortal bird, Phoenix, granting him immortality and instant regeneration. His all-female peerage consists of a full fifteen members, including his younger sister Ravel.

Plot
Introduced as Rias' fiancé, Riser is a high-ranking Devil from the House of Phoenix. As a high-ranking Devil, Riser has his own group of a full fifteen servants, all consisting of females (including his sister Ravel), something which Issei both looks up to and envies at the same time, and he sees no problem in making out with them in front of others, especially Rias and Issei. After being defeated by Issei, Riser fell into a slump. He recovered from his slump in Volume 10 of the light novels, giving advice to Rias on her Rating Game and warning Issei that should he mistreat his sister, he will burn him to a crisp.

Powers & Abilities
Because the Phoenix Family has inherent powers that are equivalent of the legendary creature, Phoenix (which the family's name is also derived from), Riser's abilities reflects those of a Phoenix, where he can regenerate from almost any injuries immediately and is practically impossible to defeat. He is also capable of using fire and wind attacks as the Phoenix Family also represents fire and wind.

Trivia

 * Riser is the only Devil to have a full set of servants in his peerage.