Bert= Herb

For his name I first looked at what Bert could be short for and I settled on Herbert because it could be shortened to Herb which can have drug connotations. (Image source: http://www.riggsconstruction.com/tips/cleaning-the-chimney/bert-mary-poppins/ ) Bert has a number of jobs in the film such as: one man band, chimney sweep, street artist and kite salesman. I've parodied this by making Herb a: busker, drug dealer and graffiti artist. I believe these three are a lot more likely to be seen in the streets today than Bert's professions and they fit into the bleak world of the comic more naturally.
Bert is like a narrator in the film and breaks the fourth wall on several occasions to talk to the audience, this is reflected in the comic by Herb explaining things through narration in text boxes, he is the only character who's thoughts are shown.
Like in the film he is the only one other than Mary/Cherry who knows of 'Supercalifragilisticaxpialidocious'.
Herbs appearance is largely based on a person I know personally who fits many of Herbs characteristics and ways of life. I have roughed Herb up a bit to try and show a harder life and perhaps suggest at homelessness.