This was originally written as a comment for
this post, but it's essay-enough to go here. This is Millicanon only, and isn't relevent to Haddyn!Mel or Other!Mel, but it's an interesting character study anyway.
Mel takes family very seriously, and she considers it the most important thing in the world. She (and I the mun) never intended for her to adopt herself a millifamily, but somehow it happened. Even with her
real twin brother in bar, there're people she consdiers herself closer to.
Mel's mother left when she was a baby, her father died when she was eight (those are my additions). Her brother died when she was fourteen. All she has at home is her older sister. She intends never to replace her.
Mel's never had an older male figure in her life: as well as the death of her father, she never had a Watcher, and her boss, while undeniably male, is a giant fish. Her friendship with
Indy, which developed over him trying to make Mel and Mike realise what they meant to each other, quickly became too familiar for just friendship, and he filled a Watcher-shape hole in my Slayer's life. He's a combination of big brother and young, wannabe "trendy" uncle.
Lilly's family as well: she's the cousin of a similar age that you wouldn't really be friends with if you weren't related, but you love anyway and have a lot of fun with. The fact that she gets on with Indy and Mike just enforces this. She's family Mel didn't exactly choose, but she wouldn't change her for the world. Also, the possibility of becoming kissing cousins is still kind of exciting.
Steph's Mel's little sister. Her secret little sister she doesn't share with the boys. The little sister she wants to protect and at the same time show the world to. Like many big sisters and mothers, Mel wants Steph to have the things she didn't have. She sees a young girl a lot like herself, who doesn't have the burden of Slayership. It's a combination of living vicariously and genuinely wanting the best for her. It's just deeply ironic that she's chosen a dead girl for this purpose.
And
Mikey. Well.
He has no special powers, no genetic modifications, but he's still fast, strong, skilled. He can keep up with Mel most of the time. He'll go on adventures with her. He loves her for who she is, and he makes her smile just by being there. He's pretty much everything she secretly always wished Harth was.
Without Mike, Mel wouldn't be happy at Milliways. She'd be restless, touchy, and introverted. She'd have broken much worse than she has, with no one to put her back together again. She'd never even be friends with people like Lilly and she certainly wouldn't have adopted herself a family.
Mike's her everything.