In the first video David is representing a hip-hop artist/performer. You can tell as he is wearing many stereotypical items of clothing for the kind of artist such as; a snapback cap, a jumper with the hood up, a bomber jacket and sunglasses. His actions also portray the character and he is using a lot of hand gestures and moving around a lot.
In the second video, David is representing an indie artist/performer. He is wearing a fedora hat, a bomber jacket, round sunglasses and is playing the guitar, these are all stereotypical things you expect from an indie artist. He is swaying his head as if he is playing something slow and emotional, also stereotypes of indie music.