You'd want to look into autosuggestion / hypnosis / deep somnambulism reprogramming of your subconscious.
I've seen accounts of people using this technique to change hair and eye color and adding several inches to their height (also to instantly heal bone fractures, regrow teeth, et cetera). To become a Chad, you'll want to be tall and have good bone structure; deep somnambulism is the place to change your physicality. Obviously, hypnosis is also good for any personality changes you want to make.
All magic (imo) is essentially a matter of issuing directives to the subconscious, in accordance with the 1rst and 2nd Hermetic Principles (Mentalism and Correspondence: All Is Mind / As Within, So Without).
Couple sources for further study:
http://probablefuture.com/
http://www.merlinworld.com/