you mean they are one person but with different personalities?
but does the personality change according to whether it is night or day or if he is with people?
Ok but imagine an AU where Chris and Toodles aren't actually separate people, like a Doctor Jekyll Mr Hyde kinda situation.
Like, during the day he's respectable famous Zoologist Chris Kratt, but if you catch him in the streets at midnight he's the insane and unpredictable Toodles.