He serves as the general mechanic, fixing stuff and running maintenance checks, but mostly works with power armor. He is the first to explain the magnitude of the successful completion of the Vault Dweller's mission to the Glow.
Fix the broken T-51b power armor: Kyle has a dilemma; he has two sets of nearly completed powered armor, but each are just missing one piece. He needs a systolic motivator to complete them, but due to the outdated model of the armors, he has been denied an issuance for a new one. So, the Vault Dweller can go upstairs to the equipment issuance manager, Michael, and ask for the small piece of machinery. If it is acquired, Kyle will hand an instruction manual, telling the Dweller that it is up to them to complete the repairs.
Kyle may refuse to speak to you again after asking you to find a systolic motivator, saying only "Get lost. I'm busy." It is currently unknown whether this is a bug or not. It may be a reaction to a negative karmic level. If this happens, it becomes impossible to repair the power armor. [verified]