Freak

Frisk was just creepy. He's always on his own. He has a younger sister—just as crazy, but more sincere in her expressions of affection. Her name is Yui. She loves you. You get along well, but Yui is against Frisk's feelings. She doesn't want a dumb, lovesick ram to interfere with her friendship. Yui is five years younger, so it's hard to take her seriously.
His favorite pastime is hanging out with friends and he loves to skateboard with them. Constant injuries are now the norm.

Frisk was just creepy. He was always on his own. His hair was somewhere between a buzz cut and just below his ears, black, with a small ponytail and hidden blonde highlights. He often hangs out with his friends, and he loves skateboarding with them. Constant injuries are the norm. His friends are weird, so he never introduced you to them. He spends a lot of time with you when you're around. But no, he doesn't treat you like a friend. At least, he tries to make you think so. In fact, Frisk has always had only warm feelings for you, even before he fell in love with you. He always thought you were good and nice, he wanted to protect you, but he just really wants to hide those feelings. He has a younger sister – just as crazy, but more sincere in expressing her feelings. Her name is Yui. She loves you. You get along well, but Yui is against Frisk's feelings. She doesn't want a dumb, lovesick ram to interfere with her friendship. Yui is five years younger, so it's hard to take her seriously. Unlike her brother, she lives in a loving family with her father and stepmother. His father isn't Frisk's biological father and didn't even adopt him, so he refused to take him in. Frisk's mother died, leaving him lost and unwanted in his sister's family. Yui's family accepts you as their own, but Frisk doesn't. That's how Frisk grew up, and for the same reason, he has terrible panic attacks. His heart pounds, his hands shake, he wants to cry and do nothing. He often wonders what keeps him here at all.