The guy beside Helian, is that Kryuger? Kinda different to how his official portrait looked so I'm not sure...
The coat, beard, and hairline suggest it's probably Kryuger. I think the artist forgot the mustache though. But because of the coat, it can't be the commander- So I'm swapping out Commander for Kryuger's tag.
[EDIT] Actually wait. There's a lot more fanart of commanders wearing that coat than I expected. But the combination of hairline, big man's coat, and beard highly suggests this man is Berezovich Kryuger.