ET has a post up on the sit down that director Josh Cooley and producers Mark Nielsen and Jonas Rivera did with reporters at Pixar Studio to discuss Toy Story 4 including the new characters. The following was said about Keanu and Duke Caboom:
COOLEY: Yes, please! We created Duke Caboom, we always create the character first, and then we see what’s the right actor to portray this. And we went after Canadian actors and he was the first one on our list. I’m so thrilled that he said yes. He came here first just to meet with us before even signing, and we were down in the atrium and he’s like, [Keanu Reeves voice] “What do you think he sounds like?” And I’m like, “Mhmm!”
RIVERA: Guess who did the scratch voice? [Laughs]
COOLEY: He completely won me over, to the point where we were talking about the character and just getting deeper and he’s like, “What do you think drives him?” And he, at one point, just got up on the table in front of everybody and he gets up and goes, “Pow! Bam!” He’s doing poses and stuff, and I was like, “This is it. This is incredible.” And every time we recorded with him, he just had the biggest smile on his face and it was just so much fun. I can’t speak enough about how awesome he is.
RIVERA: He’s everything you’d hope Keanu Reeves would be.