There are a lot of goofy villains but none match the king of silly characters..Mr Myzxllk..he is such a goofy charcter..that you next never expect him in Man of Steel..true if they go with the comic version he wouldn't fit at all with Man of Steel..but i have a idea on how they could make Mr Myzxllk the main villain of Man of Steel 2
Backstory:
A Kyprotaian scientist that was responsible for the the super computer known as Brainaic, he enjoy all the praise and success he got from the Brainaic until one day..he was teleported to the 5th dimension by the Council..i group of very powerful begins who manage the universe..they condemn him for the creation of a being that could wipe out the universe..they told him that Kyprton is going to expload soon and you must help it to happen. They gave him the 5th Demenshion Powers and teleported 20 Year into the future..He finds out that his home planet of Kyrption has been destroy. The Council tell him that Brainaic is destroying everything and only the Last Son of Kyrpton can destroy Brainaic. The Council tells him that the only way Kal-El will be able to defeat Brainaic is if Superman had nothing to lose. Under the new name Mikhail Mxyzptlk..he travels to Earth in order to find Kal-El..i prepare him for the might of Brainaic
Personallity:
Mr Myzxllk is a lot less goofy this time around but still likes to pull pranks..he is very focused on the mission and will stop at nothing to succeed in his mission even if it means the cost of Kal-El's Humanity and thousands of lives lost..when he wants to he can even be slight sadistic..especially when he is toying with someone. He believes every bad thing he is doing is right and doesn't know the consequestions of his actions.
Appearance:
His design is a mix between Golden Age Appearence and the Smallville version..he wears a suit much similar to his Golden Age suit but is much taller..some times she wears a black leather jacket with his logo for fun..he has hair and is not bald.
Actor:
Matt Smith
I think he would make a great Mr Myzxllk because he could have a great mix between goofy and serious..personally i would love to see Matt Smith as Mr Myzxllk.