Pet names I think some of the characters from Endfield would call their partners
Catcher
I have a feeling he’d often use more Spanish petnames, like dulzura (sweetness), cariño (dear), corazón (heart), or Tesoro (treasure). He prefers names in his native language, he finds them more personal and natural to him.
If he’s been away from his partner for a longer time, he might throw in a possessive “mi” in there. Not because he’s jealous or doesn’t trust his partner, but because he likes the emotional connection of affirming your partnership. He just likes feeling close, especially if he’s been gone a while.
Wulfgard
He doesn’t feel the type to use very many petnames, but if he did, he might use ones in Italian a lot like how catcher uses petnames in Spanish. Cucciola/cucciolo is puppy/cub, but means more along the lines of honey/sweetheart. He also seems the type to use caro mio/cara mio, meaning dear. Very rarely, he might call you la mia luna, meaning my moon.
He’s more likely to just call you by your name or a nickname you tell him you like. He finds intimacy in identity. He just loves your name.
Antal
He tends to come up with really weird or out there pet names. He called you “firebuckle” once, completely straight faced and people couldn’t figure out if it was one of his attempts at a bad joke at first. Glowbug is one he uses a good bit, and if you asked why, it’s “because you’re bright and eye catching.”
It’s not that he’s completely avoidant of more traditional pet names, but he’s always been one to experiment and try to draw reactions out of people. If you seem to like one of his more out there ones, he mentally bookmarks it and it joins the rotation.
He does like my dear a lot. And dove, he has an entire detailed explanation as to why, but it can be simplified to him finding you to be a source of peace and comfort, like doves are in imagery.
Pogranichnik
He uses very traditional pet names. For him, there’s elegance in the simple my love, my dear, my heart, beloved, darling, and dearest. He demands the utmost respect for you from himself and those around him, and he will not dare let himself refer to you with anything less than devotion.
He’s just as likely to use a more regal Russian pet names. One he’s found particular fondness of is zólotse, meaning my gold. He also finds umnitsa one of his more common ones, meaning clever. Lyubov moya (my love) and zvezda moya (my star) are also ones he’s used. Very elegant, classic, and gentle.
Fluorite
She likes more basic ones like babe, baby, cutie, hot stuff, doll, and sweetheart. But her favorite is hun. She couldn’t really tell you why, she just likes the way it rolls off the tongue. Plus, “it’s sweet like you, so it works.” She’s not someone who sees a point in needlessly complicating something as basic as terms of endearment. It’s just not that deep to her.
She calls you “mine” though sometimes. She likes feeling like she truly gets to have things, and so you being with her matters a lot. She takes pride in that and likes to remind you of your relationship.
Arclight
For her, pet names are a bit weird. She’s more used to code names and the Hannabit Circuit tends to call members by their title and name, like Aldertone Orisha. At Endfield, its operator code names, like Perlica. She’s not used to calling people petnames, so it’s nothing personal if she doesn’t use them for a good bit. She might start calling you love or beloved, since to her they’re a bit like a title or rank.
It takes her a while to get comfortable even with that, but as she slowly gets more used to petnames and similar, she might tear out ones like my song or my muse. She’s still likely going to call you by your name, since she just prefers names, but one she’s found that she likes is my tempo. It’s a little more out there, but to her you are the steady beat guiding her steps and song.