Team Dad: It shows especially when Lagerfeld comes to kill Zephyr, how Vashyron feels about his companions; acting lightly at first, when Lagerfeld invokes a friendship between them thinking that will give him the boy, Vashyron snaps and blocks Lagerfeld from coming in.
Leanne: Agh, this skirt's too short! Zephyr: Now all we need is a trampoline. Leanne: What did you say?! Zephyr: I said, "the hem looks really keen."
Mood-Swinger: He can either be jovial or brooding, and frequently switches from one to the other.
Phlebotinum Rebel: He was part of a second set of experiments by Sullivan, which gave him increased speed and strength, but also unhinged him to the point of causing mass murder.
Jerk with a Heart of Gold: Despite his sociopathic tendencies, Zephyr leapt without thinking to save Leanne at the risk of his own life, offers her his jacket when she looks cold, and risks his life to retrieve her cold medicine when she gets sick.
Zephyr: I want Leanne to be happy.
Naytheist: He has plenty of misgivings about faith and God and doesn't mind showing it.
Pet the Dog: His concern for Leanne's well-being is the one consistent sign that he's still got some humanity left.
The Chick: Though definitely not the passive version.
Driven to Suicide/Interrupted Suicide: The first time you see her in a cutscene, she's jumping to her doom, only to be saved by Zephyr. Later in the game, we discover that she did so because she believed she was about to die anyway and wanted to do so on her own terms.
Kicking Ass in All Her Finery: Her default◊ outfit is a dress that looks a bit like a winter coat with knee-length boots complete with stilettos and a nice ribbon at her neck. And she kicks serious ass while wearing it.
Magic Skirt: Averted and played straight. Leanne's outer dress (or possibly coat) does ride up with all the flips she does, but there's another skirt underneath that that doesn't seem to budge. Outfit B averts this trope but some of the outfits in B have a pair of black leggings on her. Some don't.
New Meat: As noted above, she's considered the least experienced member of the team; and it's implied that she only recently (as in, a year after she moved in) started accompanying the other two on their missions.
Mind Rape: Her current mute childlike self is a result of Zenith doing this to her.
One Woman Army: A few years prior to the game, she invaded Basel with the goal of wiping its people out. She killed the entire Lucia excavation team, including Victor, and was about to kill Vashyron when Zenith intervened and broke her mind.
Pet the Dog: It's pretty obvious from the ending sequence that he genuinely cares about Rebecca.
Well-Intentioned Extremist: Arguably applies to him too as he is also following Frieda's ideals albeit in a different way. While Rowan's goal is to control Zenith to prevent it from spontaneously killing people, Sullivan's goal is to free people from it entirely by making them like Rebecca. He eventually succeeds in making himself free but along the way Crank Seminary (among most of the plot) happens.
"I'm alive! You all saw it, each and every one of you! I've been chosen by God!"
Chekhov's Gun: In his first scene, he is given his quartz stone, which he fashions into a ring. Later, he punches out a monster threatening Leanne while wearing it, causing the ring to shatter. Pater dies.
Reasonable Authority Figure: Seems like a real nerd at first, completely and totally awkward. But one soon learns that he deeply cares for the common people and is devoted to clearing out areas so they can have places to live.
A close contact of Vashyron, Cardinal Theresa often gives missions to him and his team.