Basic Trope: A Moe support character, usually a child, who is part of a mostly adult or teen cast.
Played Straight: Alice, a 10 year-old girl who travels along with a band of heroes, all of whom are in their teens.
Exaggerated: Alice is a 10 year-old Innocent Fanservice Girl.
The kid is a 6 year-old in a cast of old people.
Justified: Alice is either wise beyond her years or a Little Miss Badass. So despite her young age, her presence contributes much to the team.
Inverted: Bob is an adult or teenager, in a group consisting mostly of children. Bob is treated as simply a member of the group and not a mentor/teacher/consultant.
Subverted: The scene where the heroes adopt young Alice's is just a flashback, she's at least a teenager when the story starts.
Although they take care of Alice for a story arc, the heroes leave her in care of her parents afterward.
Alice is main protagonist.
Double Subverted: Turn out that she's a Shape Shifter, and prefers to take the form of a young child.
Deconstructed: A child on the team could cause problems: Alice could be a whiny Spoiled Brat, or what if her parents don't approve of her being taken on an epic journey at such a young age? And what about school? Alice's future depends on it, after all...right?
The teenage heroes have no idea how to deal with a kid. Things are much messier with Alice living with them.
Her Innocent Fanservice Girl act is intentional. Being an orphan, Alice can only survive by using her charms.
Reconstructed: Alice is very emotionally mature (or becomes more mature during the adventure), and the heroes see to it that she is well taken care of and educated.
Now living with the heroes, Alice can drop the act...and it turns out that she's still really innocent.
Zig Zagged: ???
Averted: The heroes are all children or pre-teens.
Enforced: The author wants to attract more of an older audience and make the tone Lighter and Softer at the same time.
Lampshaded: "Why's there a kid in your group?"
Invoked: The team picks up a little girl (who apparently has exceptional powers, or simply good fighting skills) and makes her part of their group when she helps them out.
Defied: The hero or team are ChildHaters, or simply being concerned for the child's safety in the possible dangers ahead. They will not be working with any children or accepting them as team members.
Discussed: "So you guys really want to bring her along? Are any of you good with kids?" "But she's cute!"
Conversed: "So the girl's really in the regular cast. I wonder how she will affect them?"
Played For Laughs: The male heroes often get mistaken as Lolicons for having Alice tag along.
Played For Drama: The journey isn't fun at all. Tragic incidents like watching her Big Brother Mentor slain in battle, or even an entire Break the Cutie story arc, can't be good for her. The Hero tries his best to keep her positive outlook or even her sanity when things go really bad.
Despite her looks, Alice is actually an adult. She's upset that he gets treated like Just a Kid, and no one believes her when she tells them otherwise.
One of the heroes actually has romantic feelings toward Alice. However, he can't express his feelings because Alice is just too young, or he doesn't want to be labeled as a Lolicon.