(OK, THIS WILL TAKE A WHILE!)
Borril: Yes, he actually has a very strong stance against killing his opponents in combat, in only two situations has he compromised these beliefs, because of self defense or because it put them out of their suffering. Neither of which weighed particularly well on his psyche.
Azzrie: Surprisingly no, while her morals are quite loose, she will never break her morals for any true reason, she is actually quite steadfast on her beliefs.
Orvexx: Many times and often, he rarely has any beliefs or morals, because he doesn’t really believe that it’s worthwhile to have them.
Tennk the Broken: Once or twice, where he likely would have put some of his own passions in front of his own work or the like. Typically only when he is very enraged he will compromise those beliefs, he barely survived as well from it.
Blaster Bixxi: Technically she hasn’t, but I can see her compromising her own beliefs, she is young and malleable enough to know that her beliefs are only a small mindset in a much larger world, and would change her ideals to fit.
Bernilak: Nope, he never has, and…I can see him compromising his beliefs, but it would take a lot for him to do so, (A powerful influence that would affect his character from the basic to the core probably)
Cybrilis: She has several times, partially not due to her own choices, and then she ended up changing a lot of her beliefs, she is growing and will likely change a lot as she goes through her choices, beliefs are not always solid.
Poltimir: ??? He doesn’t have many beliefs at the moment, and is too niave to really break them and feeling bad about it really.
Sabin Scarmaw: He gets what he wants, so he doesn’t really have any beliefs that are solid enough to matter.
(I’ll stick with GW2 characters, I know I have a few more, if you wanna see DH and Starbound, I can do so though Yim XD)