Thanks! I usually take bits from different characters from shows I used to watch. Her love for ships actually come from me, and You Watanabe from Love Live! Sunshine. But I'm struggling with Milo and Bjørn's lore, so it's mostly going to be just Metztli, Xipil, and Quetzalli.
So I would suggest maybe taking some parts of characters, then using it as a frame for how you want your mc to be like. Obviously don't copy the personality, but taking some struggles or characteristics and adding to them or revising them helps. Like with Metztli. Metztli has the same perfection issue as Amity, but instead of it being ingrained, it's a direct result of how teachers can impact kids. Her teacher was a major jerk and often humiliated her everytime she asked a question or had trouble. So she begun to associate not knowing with being made fun of and hated, which then in turn begun to make her a perfectionist. If she's perfect, no one will make fun of her. No one will hate her if she's perfect. That's her mentality. She's not upholding a family name, she's preventing herself from being hurt.
Sorry for the yapping, I hope it helps break down how I make them, obviously I don't copy paste the characters, I just insert little references from characters that had a huge impact on me. And thank you for liking her!