"Kaylee is a girl with a kind, simple heart, and whenever the atmosphere gets tense or not so good, she tries to mediate, but she usually cracks cold jokes, making the atmosphere even more awkward, and then she complains, 'I can't stand you guys!'…"
This character is not so difficult to understand, she doesn't have a complex, conflicted mindset, but rather exhibits the normal behaviors of a girl with a budding affection and a slightly weird, funny side, so the difficulty of portraying her isn't that high. But that's just the basic expectation; for a character without too many highlights in her setup, a big-hearted and naïve young mechanic girl, how do you make her vibrant and colorful? This depends on the energy the actor brings to the role.
