Fawkes, Randall Clark, The Mysterious Stranger, and (To an extent) Cooper Howard are some of the best characters in the whole Fallout Canon. When you first see and/or hear about them, you might believe that "Not another enemy" or "Who's This", yet you get whiplash when you see them being cool to you
Fawkes is an FEV experiment who's mind was safe from the mutation and coped with the loneliness after he discovered a working terminal left in the isolation room he was imprisoned in, making him able to extensively study history, literature, science and other subjects, as the book files gave him a wealth of knowledge and insight.
Randall Clark Lost almost everything from the war, but instead of attacking and raiding he helped protect the inhabitants of Zion with all his strength
The Mysterious Stranger Help's every single Vault Dweller from The Vault Dweller in Appalachia to The Sole Survivor in The Commonwealth and maybe to LA across over 185 years and instead to killing you and going on raiding hunt, he helps save the planet, entire nations, and regions against the Brotherhood, Institute, Enclave, Mutants, and other vault dwellers
Cooper Howard Also lost everything and also discovered the plan to Nuck all of the world by Vault-Tec and his own Wife, and even with faults he ultimately helped Lucy to go to the City of lights to Robert House
These characters are to me, the Vim! soda of this wasteland