[@Click This]
Josephine thinks Arsenal is similarly insufferable compared with Hex, but at least Arsenal has a proven track record with Josephine, as well as plenty of weaponry. She personally gets triggered every time Arsenal needlessly wastes bullets, but also sees that waste as a chance to replenish her own supplies. The two used to work together to tackle larger missions as hired guns, but once Rui-Hai got involved in a long-term gig with Courtlandt Holdings, the two fell out of touch, until they met once more as Cleaners. Probably have a love-hate relationship going down.

Now, onto solid relationships...
[@Click This] [@SilverDawn] [@Psyker Landshark]
Was thinking that the 4 of them, all being users of Heavyware weaponry and being gun-spammers, could have worked together many times before during Cleaner missions as something like Fireteam WARE. Arsenal as artillery, Runner as all-rounder, End as aerial support, and Warthog as tank. They all have pretty good synergy, considering Runner's ability to accelerate bullets, End's ability to give everyone new ammo, and Warthog's ability to act as cover for the armorless Arsenal.

[@Asuras]
Already talked to you about it, but Josephine, during her younger years, would have crashed in Cafe Thaza a bunch for the free rooming. Adding onto that, Josephine probably calculated the amount of credits her room rental and maybe free meals from Mom would have cost, and has always been thinking of paying it off. Mom probably would have refused though, so Josephine would just be uncharacteristically 'nice' towards her.

Under the assumption that Venge's gang had lost members before, perhaps Josephine was involved in those. Maybe that acts as friction between the two, or maybe Venge doesn't even know due to her single-minded focus on fucking up nightmares. If Venge ever asks though, Josephine would probably off-handedly admit to offing some of her 'family' before.