Siobhan, ironically, can speak a couple languages - Xio (Xioquo), Prosabia (Vashyada), Zandri (main Qadiri language, though not the only one), Eldarai (Eldorai) and some Huttese and Twi'leki. Firemane's essentially an overlord in many areas the elf races live in, so her making an effort to learn their main languages is a sensible strategy. Makes her seem less like the foreign imperialist she is. Plus Sio loves to show off.
She picked up Huttese because she lived on Nar Shaddaa when she was younger. She hasn't been anywhere where it would be the lingua franca for a long time, so she's probably rusty. I figure she's better at understanding than speaking it.
She shared memories with Mirien Valdier (RIP), a darkside adept and former Sith, and thus knows a bit of the ancient Sith language. However, I'd say she's far from fluent. Plus she's not an academic, so she's not going to be translating ancient Sith texts any time soon.
Elpsis would know a bit of Huttese due to her old smuggler/merc days. May be better at it than Sio, ironically. As a Firemane officer, she has various Tygaran elves in her platoon and in the company she belongs to, so she's learned some Zandri and Xio, though not well. She speaks both with a heavy Basic accent and mangles the grammar a lot. Enough to show that she's made an effort to learn about the people's language and culture, but she'd have to switch to Basic pretty soon. Elpsis can't read stuff unless it's in Braille or visible through the Force somehow, which I figure impacts her learning ability.
Amusingly, I could see Enyo knowing a couple. She definitely understands and can speak Huttese, and understands binary because she has lots of droids. I could see her understanding Shyriiwook. Maybe an obscure language or two that she learned because she liked the challenge. Not Eldarai - she doesn't like the silly space elves at all.
Due to essentially being a Terminatrix with a human brain, she doesn't get tired, require nourishment or sleep (she just has a one-hour period where she powers down), so she can work for a long time without pause. Archangel just wanted her to be a living weapon, so her makers didn't give her much of an education beyond what her role required. However, Enyo was written as being a bit of an autodidact after breaking from their control, going into libraries and stuff to educate herself.
Plus, while many of her mooks are droids, she has a crime syndicate full of people from diverse backgrounds under her. Would be IC for her to just study a bunch of languages at night to pass the time. Enyo could theoretically have them added to her mental interfaces...but prefers to learn them properly. I now have this image of Enyo signing up in online linguistics courses under an assumed name, and then annoying everyone because she's faster.
Darth Libertas' mother tongue would be Twi'leki/Ryl because Twi'lek. She would've learned Basic and, because she travels a lot on the fringe, and be good at Huttese And some of the Sith language because Sith, though I don't view her as someone who excels at translating ancient texts and the like. She's the Sith Warrior type, not a mystic or archaeologist. Maybe some obscure language she learned because she felt like it since it was challenging and the Sith code is all about overcoming one's limitations.
My other characters would be more limited. Basic would have been a foreign language for Kaida, Vaena and Xalda. They learned it after their people made first contact with the 'star people' and speak and understand it with varying degrees of proficiency. Kaida would be fluent because she served as an OP soldier for many years, with her mother tongue being Eldarai.
She's probably picked up a bit of Zandri and Xio since the Eldorai group she belongs to includes the 'cousins', too. Similar with Vaena, though she'd be less good at Basic and ironically better at Zandri than Kaida. For Xalda it would just be Xio and Basic. Her Basic is heavily accented, formal and kinda stilted. Picked up a few Qadiri words here and there, but that's it. As a former slave-soldier, Xalda grew up illiterate and only learned to read and write after being freed.
