What is the major conflict in The Chronicles of Vladimir Tod?

Throughout the series the main conflict in The Vladimir Tod series was that Vladimir had trouble deciding if he was either with or against Elysia.

In book one (Eight Grade) he was with Elysia

In book two (Ninth Grade) he was against Elysia

In book three (Tenth Grade) he was pretty much against Vampire kind itself

In book four (Eleventh Grade) he re initiated his love for Vampires but is against Elysia

In book five (Twelfth Grade) he is mostly with Vampires but when betrayed by his father he realizes his power as the Pravus and is neither with nor against Vampires or Humans