Fröhlichkeit is one of the residents in Sparrow's house, additionally being her manifestation of happiness. He is usually apathetic and doesn't care about anything if it doesn't affect people important to him too much or if that thing isn't his responsibility. He is the most chill person you'll ever meet, and even if you'd try to irritate him on purpose, the most he would do is just move away. However, it's best not to rely on Fröhlichkeit in difficult situations, as he'd not help you even if you were assaulted on the street, simply because he doesn't want to get into trouble.