It has to be Kefka. You might not always agree with his policies but at least things would get done.
Cecil (FFIV)
Edge (FFIV)
Edward (FFIV)
Lenna (FFV)
Galuf (FFV)
Edgar (FFVI)
Sabin (FFVI)
Kefka (FFVI)
President Shinra (FFVII)
Rufus Shinra (FFVII)
Edea Kramer (FFVIII)
Cid Kramer (FFVIII)
Queen Brahne (FFIX)
Garnet (FFIX)
Yuna (FFX. FFX-2)
Seymour (FFX)
Kimahri (FFX, FFX-2)
Ashe (FFXII)
LaMont/Larsa (FFXII)
Vayne Solidor (FFXI)
It has to be Kefka. You might not always agree with his policies but at least things would get done.