Rose White, Mei-Ling, Zuberi, Sarah
Alex McCall is a member of and presumably an operative within the Illuminati, though his exact ranking is currently unknown. He first appeared in the CGI "The Grifter" and later in "The Illuminati" where he is seen being attacked by a mysterious being while in the bathroom.
Alex later made his first in-game appearance during the Tokyo flashback, alongside Rose White, Mei-Ling and Zuberi, where he believes the player to be Sarah. Alex is also seen discussing the recent events in Tokyo with Rose and Mei-Ling at the very beginning of the flashback. He implies that the group has met under similar circumstances before this incident as he claims they really have to stop meeting like this.
Upon the release of the New York raid in issue #4, Alex was seen in the CGI trailer, but he also makes an appearance both during and after the raid alongside Rose, Mei-Ling and Zuberi. Upon arrival Alex jokingly claims that they found Zuberi "sleeping in the park".
His preferred weapon is presumably elementalism, as he is seen using it in all his appearances to- date. Despite having a "knack for magic", and being seen using other schools of magic in his first and second CGI appearances, he seems to stick to elementalism, this indicates that he might not have a secondary weapon, but has instead chosen to focus his combat skills solely on elementalism.
Alex has yet to directly meet the player. During the Tokyo flashback, the player assumed the role of Sarah, presumably in her memory, and during the raid they have no direct interaction. It is therefore unknown if he is aware of the player and his or her exploits.
Look who we found sleeping in the park.
It, Mr thing-from-another-world Tentaclaurus Rex playing catch.