Often am up for threads! Got anything in mind, I see slave trader mentioned in your flairs in which case
Vash Walkerhas a tendency for purchases or dealings with traders, because...he needs sentient and semi-sentient minds for some of his tests. He would be
very careful about going to coruscant though. Depending on what you wanted, he could send his subordinate
Kot Vind who sometimes makes deals, separately, in order to help establish connections and sources. If that happened he probably wouldn't interact directly most of the time, if ever. While Vash is an alchemist/biologist, it's unlikely he would clarify his intentions for the slaves as test subjects or resources.
Another option is
Mariah Marr, who is definitely not on the same moral end of things. She's not exactly the most legally clean, but she's definitely much less awful. Avoids slavery and violence mostly as much as she can, and would be unlikely to participate in theft, she does do smuggling though. Her rp would probably be dependent on what she might know about Evelynn if anything, since she'd definitely not work with someone she knew was a slave trader, and if she didn't just report them (a likelihood if she found out) she probably would attempt sabatoges, remotely.