QUOTE(Hellscream @ Jan 26 2011, 10:57 PM)
Kiva!!!! All I want to know is how does Kivat makes baby ???
Where is Kivat III mother?
How did IXA made?
What is the fangire form of those two brother ?
All, many still unexplain !!!
ya, but why Kiva start as normal form ???
Kivat Bat and Sagarc are two artificial races created by Fangire, with the later being a more ancient creation. It's like this, Sagarc = Core 2 Duo, Kivat Bat = i7...

Hence, the King of Fangire will of course choose Kivat Bat over Sagarc, and that kinda made Saga an 'old' and secondary armor (Taiga has no choice but to use it since his mother Maia kept Kivat Bat II hidden somewhere).
Since both Kivat Bat and Sagarc are somewhat race of mechanical beings, I imagine them to reproduce by building their younglings themselves - Go watch the movie "Batteries Not Included", which might be where the Sagarc were inspired from.
Wataru's fangire form is unknown, since he chooses his human side anyway, but Taiga is hinted to be related to serpent.
Kiva is sealed because the true power is strong and powerful for a halfling like Wataru to handle. ~ there were hint that Kiva's true power (probably pointing towards Dark Kiva) would cause great destructions (Ultimate Kuuga level

) but it seemed that the script writer Inoue-san totally dropped the idea as the story progressed.
IXA is totally a creation of mankind, since it get improved by time... - Us human can only evolve by hard work and yeah, hard work takes time.

It is developed through secrecy but nevertheless still found out by the Fangires which is why the original King sent out Rook to massacre the lab personel including Yuri's mother. The Fangire King's duty is to stop any potential danger towards the race of Fangire including slowing down the developement of human technology.
The Fake Fuestle used by IXA are imitation of Kiva's - The Aozora Organization might have had some help from the former Fangire Queen Maia, or they might have 'use' Taiga which is why he felt himself just a tool to human and thus he ran away.