Personally, I think it's an inspired choice. Plus, he reminds me of a huggable teddy bear. James Corden likes to have fun and also make fun of himself from time to time. (That video of him auditioning for the role of Cookie Lyon with the actual Cookie Lyon is priceless.)
"Noel [Coward] and I were in Paris once. Adjoining rooms, of course. One night, I felt mischievous, so I knocked on Noel's door, and he asked, 'Who is it?' I lowered my voice and said 'Hotel detective. Have you got a gentleman in your room?' He answered, 'Just a minute, I'll ask him.'" (Beatrice Lillie)