Gearbox is just an amazing company. Not only do they produce quality games, but they are good people.
Michael Mamaril is based off a real person, whom Gearbox Software decided to pay tribute to (hence, the "Tribute to a Vault Hunter" Achievement/Trophy). A Destructoid fan named Carlo wrote an email into Gearbox Software about his friend, Michael John Mamaril, who passed away from cancer at 22. Michael was a huge fan of Borderlands 2 and Carlo thought that he would be cool for Claptrap to read a eulogy (available below).
Gearbox also made a marriage proposal for two Borderland fans, which I thought was really sweet (the reaction/proposal is included with the link).