User blog comment:B214/High School DxD EX/@comment-50.139.232.230-20151229010324/@comment-82.60.176.170-20151229013624

Some other little info:

All Issei's children has dragonic power into them and when they use it strengthens their power like Issei's Sacred Gear does with him.

Kurenai: He created the Artificial Longinus of Ixis.

Airi: Ki user and her hand-to-hand combat techniques are the same of Sairaorg. She can create 10000 rays of light when she is wearing her Fafnir's armor. She scares even her brother Ixis.

Zen: His gunblade shot bullets when he pulls the trigger on the hilt and everytime he attacks in this way his aura is increased, so his attacks become more and more powerful when he fights. He can charge his sword with so much aura that it could cover a dragon.

Shin: His swords were the ones used by Souji, Kiba's swordmaster and they are stored in one of his holy books he use in battle. He can use 10000 books at the same time when he fights.

Robertina: She doesn't like the fact that Ixis and the other brother (Le Fay's son) because they seem angry with Issei, so she loves very much both her parents and doesn't like the fact that her brothers don't understand that Issei can't stay much with them only because he is too busy with his duties.

Issei and Le Fay's son is a brat even more than Ixis.

Ixis: He's also called "The God Slayer of the Deep Crimson Sword", he is the strongest swordsman of Gremory Clan and he is so powerful that even Loki clearly fears him. His artificial Longinus is powerful but still unstable.

Is not Shiroyuki but Shirayuki (kanjis are Shiro and Yuki but together they become Shirayuki). She and Kurobara can both use Touki and Kasha (the white fire wheels Kuroka for the first time against vampires) and their Kasha moves like they have their own will.