Usually referred to as "You" which is the only name ever given to the main character of the story. "You" does not have an official name, nor does he have a nickname. While "you" may be any gender, it is inferred that "you" is a male. This is implied by cut-scenes from the viewpoint of "You" where he often sees Dr. Marissa Foster (implying a relationship) though "You" may be implied as female or male, even though he is given male gender-pronouns (him,he,his). The Beta Suiter follows Krone after he used the Alpha suit to make a Time-Jump. The Beta Suiter's use of the Beta Suit which is the major defining mechanic of the game.
Although initially he seems to be a scientist working on the time travel suits later cut scenes suggest he is an agent of a unknown agency assigned to eliminate Dr Krone if he attempts a time jump. However it does seem that the Beta Suiter would need to have qualifications in the relevant fields to work at N.E.X.T 2.