Guild Wars 2

Any lore reason why his face changed between his regular one and the one we see in Meeting the Asura? It’s been bugging me how he looks completely different in that one LS chapter.

Yeah. I noticed the same thing as you.

But Caithe’s face changed as well.

You should notice another weird thing.
Faolain and Trahearne hadn’t another face. They stayed with with faces which they had after they being born.

It is biological ability.

Canach’s look changed after the Lost Shores event from the one you see in Meeting the Asura, to the now. this is the reason given by Scott McGough for his change:

Canach’s look has indeed undergone a major change since The Lost Shores, and I regret that there isn’t more background available regarding how it happened, but let me address the question here: his change in appearance is almost entirely due to the hardships he’s endured since he escaped Lionguard custody. He’s a fugitive from justice, he’s had Noll’s freelance decommission teams trying to kill him, and he’s utterly alone, so it’s been a tough couple of months for the sylvari fugitive.

Being on the run, fighting for his life, and killing the killers sent after him have weathered Canach; plus, he made a concerted effort to change his look (hairstyle, etc.) so as not to be recognized and arrested by the Lionguard. It’s quite a come down from the high position and status he enjoyed as a secondborn (even if that status was never as high as he thought it should be), and his new, grimmer look is meant to reflect the psychological toll he’s had to pay as well as the physical one.

That answers it, thank you very much!