Lydia is gregarious and ambitious: she wants to be someone and leave a mark on the world. To that end, she went to school in Crystopia to become a crystage, and in truth she did very well. She was an accomplished student, top of her class, but socially, she was miserable. She loves cute things, soft things, and aspires to be like them, but she has an abrasive personality. She's quick-tempered, loud, stubborn, and blunt.

When she finally got out into the working world, she got a nice job as a crystage architect, but it didn't take more than a few years for her to discover she just didn't have the temperament for it. She was impatient and bored. She got into fencing as a hobby, to let off some steam, and took to it entirely. On paper, she's still an architect, but she moonlights as a magical girl (a concept she's enamored with), fighting off whatever "evil-doers" she can find and investigating "potential threats" to the realm.

One of those "potential threats" turns out to be a portal to Gaianu, where she finds herself ass up in a world full of real demons. Lost and bewildered in this dirty grungy city, the first person she runs into (literally) is Uriel. Uriel, decked to the nines in heels to the sky, looking like a literal demon. Lydia decides on the spot that he's her next nemesis. Except Uriel is not a demon. He's just some guy, but Lydia will not be swayed, she saw his ~transformation~ that night.

So it becomes this thing where shes setting up (mostly harmless to humans) boobie traps around his house and shouting about how good triumphs over evil and generally being a nuisance while he has his 6 pm morning coffee
meanwhile hes just. girl, go home.

Sometimes, she is cold and a little pathetic and he invites her in and they have instant ramen while she leers at him.