Quentin Barnes is a non-player character that is part of the enclaveThe Grange. He has a crush on Becca Collins who also lives at the Grange. The player's actions can determine the fate of their relationship, and the fate of the enclave itself.
In the DLC Breakdown, he becomes a playable character, keeping his name, description and traits, though he does not unlock the Construction Advice Radio Command.
Becca Collins: After a particularly harrowing supply run, she and Quentin got drunk and had a one night stand. She didn't think much of it, but Quentin expressed a desire to pursue a relationship. The player's action (specifically, during the mission Bad Tidings) can determine the outcome of their relationship, as well as enclave's eventual fate.