one of the main things about Rex is his belief in people. the whole "a person's a person, no matter how messed up they are": a sense of hope and empathy. basically the theme of the show! and it's shown off so well in Plague
you can see how WK and Rex both begin to understand each other, humanizing the other from "my asshole boss" and "that EVO weapon". pretty big character development moments like WK ultimately and immediately following Rex's plan when the chips are down and Rex saving WK from being reinfected at the end (which is, given how Holiday reacted, surprising), paving the way for mutual respect and fondness in S3
Rex even says "in a weird way, White Knight and I are sort of alike. we're both one of a kind, and that's worth something". WK clearly does not like being in the office (people uh, don't usually call their beloved abode "sterilized box"), he enjoys being out in the field, he loosens up the instant he can fight and actually jokes around. Rex has realized they're two Providence figureheads locked up until they're needed, reduced to the role they serve humanity
beyond that, WK used to act closer to how Rex acts, they both have an interest in engineering you wouldn't expect, they're both people who use mechs and technology to fight, they're both one of a kind freaks immune to nanites in some way, they even have the same naming taste (the Big Hurt was originally the name for a cut Rex build)
also I could write a whole post about the dual tantos in Promises, Promises and how they literally symbolize the dual promises in the title but this is getting a little rambly and off-topic. but know. I am thinking of it.
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