Super Looney Tunes was a McDonald's Happy Meal promotion from 1991. There were four figures each with a snap-on plastic "costume". Each character was a parody of a character from DC comic books: Bugs was "Super Bugs", Daffy was "Bat-Duck", the Tasmanian Devil was "Taz-Flash", and Petunia Pig was "Wonder Pig". An "under three" toy of Daffy in a soft plastic Batmobile was available as well for kids under three years of age (not shown). The fine print on the bottom of the bag points out that this was an "authorized parody" (DC comics characters, of course, are also owned by Warner Bros.).
Here are the front and back of the Happy Meal bag:
I am sure some TV spots promoting the toys were made but I have no memory of them (and haven't seen them pop up online). I do wonder if WB intended to do anything else with this "Looney Tunes-as-DC Superheroes" concept... I don't think they did anything else besides this single Happy Meal promotion with the idea. The DC superhero spoofing did become a regular schtick of the Tiny Toons, though.
I also wanted to point out a little blurb in the upper right hand corner of that Happy Meal sack...
Yes, Looney Tunes were still such a regular sight on television at the time that they didn't even have to mention what channel to tune into! You could pretty much just turn on your TV and find some channel airing Warner cartoons.