Not to mention the classicists these two were at first Why does he even owe him telling him stuff like that?
Right? He seems like just another greedy prick who will covet his daughter's power. Seeing his reaction, Dad was obviously correct bc why are u mad? Bc you didn't get to use her?
Not to play devil's advocate but...
I know we can rationalize him to be an ass for yelling at Blake, but I think this is more understandable when you realize he probably isn't aware that being a Rotioum can be dangerous. The way Blake and the Gerwer Duke act, we can assume that their generation didn't know of any Rotioum, and as such the side effects were probably unknown too. Blake knows this can be risky for Riche because he saw the cause and effect himself; just like Deon also did. The two of them have a reason to stop Riche from using her powers, but since the Ice Duke guy doesn't know any of it, he doesn't see this as "protecting" Riche. He doesn't know she needs protecting. For him, specifically, this must have been more of a betrayal in a sense of "you knew the only person who could save every ducal family and you still kept it to yourself?"– not something about not being able to "use" Riche.
Iirc, too, the ice ducal family is known to be wary of using their powers and also scared of the early-death their "curse" can get them. So, honestly, I don't think it's fair to blame him. No one wants to die, and neither do they want their children to die; so if you just found out your friend has been keeping from you the one thing capable of saving you and your child? Not even trusting you enough to explain it at least? That would be sick. No one owes anyone an explanation or any kind of information, but a topic as sensitive as this can easily feel like betrayal.
Anyway, he's shown to be an understandable guy so far (I mean, he tried to stop that letter from getting to the Gerwer Duke didn't he?), so I think it's fair to give him a chance until Blake explains why he never revealed Riche's Rotioum status. It seems like he'd understand the situation.
Whether blue hair knows it hurts or not, he will know that being Rutioum will automatically mean that every ability user will be after Riche to use her and most wont care ab her comfort or wellbeing, so he should understand why Dad kept it a secret. The less people know the better. Feeling sad is one thing but being angry and yellling shows entitlement. Its up to Riche who she wants to know and who she wants to help so he has no right to be getting angry. No one wants to die, sure but someone dying doesnt mean you're entitled to your friends' every secret nor does it mean you should expect to use your friend's daughter. He can feel betrayed, thats fine but expressing it as anger is wrong.
Blue haired dad…why are YOU YELLING??? For all you know, his daughter just saved you and now you’re angry he didn’t tell you about her earlier??? THIS IS EXACTLY WHY!!! smh. You have a child too, so why are you angry at him protecting his child!!!