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.
When Beta Suiter defeats Krone, He uses the auto return system and goes back in time, and saves his girlfriend, however when he is going to remove is mask, a paradox is iniment, and the suit sends him to safety. What happened to the Beta Suiter or the suit after that is unknown.