It's good for your character to be unique and different. Lucy is highly intelligent yet eccentric. She has no understanding of the social world and that's what makes her unique. It's not in a way where it's like "Oh, my gawsh. I'm powerful and I'm only eleven."
The same goes for relationships. I will admit, there are little kids in the real world who think they're "in love" with their "girlfriend/boyfriend" but in the RPG, it gets a little weird seeing almost every first or second year out there in a serious relationship. When that happens, the characters all seem the same. Thus...there's nothing special about the characters, the plot-line, etc.
Like I said, it's extremely good for characters to be different and whatnot but in a regular, normal, kid/teen-like way. Like..."I like eating my homework after I'm done with it."
Now that makes everything interesting.