Allow Sponsorship companies to pay fighters that are under sponsorship deals for 'advertising events'. Have a limited amount of these events per month and cap fighters off at 1 or 2 per month.
Sponsorship Fighter Advertising / Commercial
Fighter Receives Popularity Boost (not hype) and company receives hype boost based on fighters popularity / hype. bigger the advertisement the more expensive.
News Paper Ad
etc. think of things that make sense, put some thought into it. I speed-balled that list together in seconds.
I think the ads (depending on what they are) should appear on the front page of the website. Needs to be something simple that squeezes the fighter avatar in there. i.e. a few hollywood billboard templates (and other advertisement styles) with a box space for the fighter avatar.