He grieved for the loss of her and Yugande (who was killed shortly before she died), and during the final battle, with him the last villain standing, he called for them to watch him the same way the heroes are more prone to doing when avenging someone who suffered Death by Origin Story.
His powers have a Weaksauce Weakness time limit at first.
She is a gluttonous young girl who comes off as The Ditz, but like Kenta, she's also Obfuscating Stupidity. She's basically a milder version of Kouichirou.