“Whoa! A Potter? In Slytherin.”
-- Craig Bowker Jr. (CC1.4)
Craig Bowker Jr. is a Slytherin student present at the sorting of Albus Potter, Scorpius Malfoy, and Rose Granger-Weasley (CC1.4).
Craig Bowker Jr. is a student at the Hogwarts sorting surprised that a Potter is in Slytherin. (CC1.4)
In an alternate reality where Scorpius is Scorpion King, Craig does Scorpius' homework for him as a demand. (CC3.4)
When Harry and Ginny try to get into the Slytherin common room to confront Albus, Craig tries to stop them, commenting that it's against the school covenant for parents or professors to enter a House quarters without permission. (CC3.15)
Delphi kills Craig when he tries to warn Albus and Scorpius that the entire school is looking for them. (CC3.19)
Craig is most likely a pureblood or half-blood.
Craig was probably named after his father.
Craig seems to a smart student because in CC3, Scorpius makes him do his homework for him. (CC3.4)
When Cursed Child first premiered in the West End in London, people were urged to #KeeptheSecrets. However, some information got out. #JusticeforCraig trended on Twitter, and the rest of the Harry Potter fandom, who had not seen the play, wondered who in the world Craig was.