Walter

"A researcher at Dreamsend Research Inc.

A ruthless sort; highly passionate about research, and will pursue any means to an end."

Personality
Walter's personality is marked by a sadistic sort of standoffish cruelty, he very explicitly believes he is too good for most of the people surrounding him, and he is not afraid to show it. At the end of the day, what he values most is his research, in a very self-contained and arguably selfish way, shoving all people aside whether rude or kind for the sake of satisfying his own curiosity about the world around him. Hurtful bluntness, whether deserved and true or not, is just part of who he is. It seems that overall, he is a wholly unpleasant person - how much this is exacerbated by being in Russell's dream is not 100% clear - and he barely seems to warm up to Russell at all even by the end of the story.