"Don't worry about his opinion of you. Unless you become his slave, it won't matter one bit. 

Viridian, do you have a preferred name?"

"-Mazen Broggs, scarlet*. And, uh, do you have a preferred-"

*scarlet = a formal term of address for reds**

**reds = the subset of humans with red hair and red eyes

"Arly welt-Karilya. How strange is this situation for you, Marc?"

Anyone's opinion of him being entirely unimportant sounds unlikely, but it's really not the question to focus on.  The slavery is, but doesn't seem a good first choice of topic either - he'd like to get a slightly better idea of what this world is like before he starts trying to talk about something this high-stakes.  And he should really just answer the questions of people who have a better idea of what's happening than he does.

"Entirely.  I've never seen a person with green hair, or a building this tall.  Which probably doesn't make any sense to you, does it?"  Maybe he's wrong about that and they do have some sane explanation for how he's here.  But it seems unlikely.