Temper

When Aantha saw what was happening, she smiled an adorable smile while sliding between three blades with a practiced grace. She didn't seem to be taking the three women around her seriously at all. 

"Brother-in-law, watch out! He's very, very, very powerful. His name is Orthros and he's a member of the Sky Clan. His big brother has always had a crush on big sis so I think he's mad about that, make sure he doesn't find out how much big sis likes cuddling with you, or else he'll get really, really, really mad."

Aantha's voice echoed with "concern", but if Ryu was a different type of person, he might have already been rolling his eyes at this point. However, not only was Ryu not a normal individual, when he learned of the reason Orthros was targeting him, his already cold gaze turned malevolent. 

All of these young geniuses had tempers, but they were entirely unaware that the one with the most fearsome temper among them was actually Ryu himself.