So why would we do this again?
Since he appears to be almost a complete bastard?
Also good to know you already decided were going to do this.
edit:
"
Big Bad: If anyone were to be classified as such in this series. He's either directly or indirectly responsible for the actions starting the War of Five Kings, those being goading Lysa into poisoning Jon Arryn and blaming the Lannisters, feeding half-truths to Catelyn to make her move against Tyrion, and betraying Ned Stark and quite likely influencing Joffrey into executing him. Then eventually, when the time is right, he swiftly turns against the Lannisters by masterminding Joffrey's death and abandons the crown to the massive debt to the Iron Bank he's racked up for them over the years."
Are you
sure this isnt actually a terrible idea? He routinely manipulates everyone around him into killing each other for slim benefit, fun, or because he feels like it.