Takiko Ushina is the Ultimate Little Sister.

She works as a little sister for hire. Takiko Is generally a bubbly person, always eerily happy- almost never not smiling. She loves making other people happy and craves other people's smiles. She doesn't exactly know how to handle negative emotions and tends to go into laughing fits when she's incredibly upset, The girl tries to act younger than she is, mainly in an attempt to get people to protect her as she's seemingly very weak. She often bursts into long speeches about friendship that tend to annoy almost everyone. Takiko also tries to avoid romance at every opportunity, especially other people who are in love with eachother. Despite everything and her childish attitude, Takiko has a surprisingly cynical view on life and her humour can be described as dark.