As much as Ankei despises Daija, he has enough honor not to take out his hatred on Ina and Tokitaro. This is between him and Daija. Whatever reason Daija had to kill his master, the most obvious being he tried to kill Daija, lost and then got eaten, it makes sense Ankei wants him dead for killing the person who took him under his wing. Though I wonder if Ankei really believes he can kill Daija, or if his drive is suicidal and just wants to provoke Daija to the point that he'll be fed up with him and eat him... Tokitaro's interest in art is fascinating, as well as him being able to power through the differences and trying to act more human. Ina on the other hand seems more the opposite, despite her mostly human appearance she prefers to embrace her animalistic side. I could see some implications of possible attraction towards Ankei...with her rapid snake-like growth spurt, and the fact that snakes reach mating age around 2-4 years that might become a point of contention in the future.