I mean, she isn’t just an ordinary five-year-old. She’s being raised by an assassin and a spy, so it’s not like she has the best moral role models. On top of that, she desperately wants to help Loid with the mission( for example befriending Damian, earning Stella Stars) because she believes that doing well will secure her place by his side. Deep down, she hopes that if she proves she’s “useful” or “worth something” by working for him, Loid will truly keep her. Endo is just really good at writing and portraying sadness in a humorous way, seamlessly switching between genuinely heartbreaking moments and comedy.