Multiple character personality

Dear Ask The Doctor:  Hi,I have recently (2 yrs or so) started to gain ability to switch between Two personalities. At will, I can change from one personality (Usual me)to the other(New personality- which has the following features: It's extremely humourous,smart and witty, The personality has some resemblence to a child whom i know, I have to change my voice inorder to attan this mood, I feel extremely happy and expressive in that mood....Can you please help me with the name and category of this state? I never feel depressed though

Dear Patient: 

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