Well, ignoring any possible guest and new character, which means my interpretation is bound to not be 100% correct, because we all know there will be at least one or two guests and one newbie, the first three codnames could mean, respectively, Rock, Aeon (who, by the way, is the Lizardman we always knew, people, stop referring to him and "Lizardman" as if they were different, they're the fucking same, aside from the generics from SC2) and Setsuka. The first two are pretty obvious, Setsuka had her name changed to "Neve" at some point in the old timeline, which means "snow" in portuguese. The explanation for star discussed above seems like a good justification for it to be actually Algol and I honestly cannot think of anyone who really fits that codename. Yell and Yellow are pretty weird, I don't know any character particularly known for yelling, nor anyone who actually has yellow as its signature color, but if I had to guess, I think "yell" seems like a thing Yun-Seong would do quite a lot, because he is hot-headed, and yellow could be Dampierre? Which kinda means that this pass would be garbage, because Rock and Dampierre are very hated characters and Algol is not that popular either, despite being incredibly hot in SC5. I'll think of possible guests that could fit those nicknames later.