Paptimus Scirocco.
Let's just run down the list of things that he does.
-Starship captain
-Prototype Mobile Suit designer
-Mobile Suit ace pilot
-Military officer
-Seducer/Pimp
-Powerful psychic
-Leader of the Titans and by extension, the Earth Federal Forces
There you are, watching Zeta Gundam. The Titans, as far as anyone knows, are just Saturday morning cartoon villains; typical fascists who are assholes because they enjoy being assholes. Then this smooth pimp-daddy walks on the screen and Reccoa Londe, the resident spy and strong independent woman of the heroic Anti-Earth Union Group starts having stomach butterflies for this guy. Paptimus Scirocco is introduced as an ally of the Titans, and he works his way to the top of the Earth Federal Forces' special branch, the Titans, and gains the support of their leader, Jamitov, by swearing a blood oath to the man.
But it's clear that not only does Scirocco have an agenda of his own, but his Newtype/psychic signature is so powerful that newtypes like Char are feeling sick and losing their fudge just because the dude flew past them in a starship during Operation Apollo. He has his own groupies like Sarah Zabiarov, and he's seduced Reccoa over to his side, while making friendships with skilled ace pilots like Yazan Gable. His plans and strategies like his capture of Von Braun city were well-executed, and he pilots his own specially-designed mobile suits into battle. Mobile suits that were designed to operate in Jupiter's gravity well, which meant that they were heavily-armored and fast compared to the mobile suits of other pilots and factions.
Eventually, Scirocco makes his big play, assassinating his boss Jamitov and blaming it on rival Newtype and Neo-Zeon leader Haman Karn. Scirocco then sends his men to kill Bask Om, Jamitov's top lieutenant, clearing the way for him to seize control of the Titans as a whole. Since the Titans by that time were in charge of the entire Earth Federal Forces, and the Titans' leadership position passed on to Scirocco after Jamitov and Bask Om died, this left Scirocco the de-facto ruler of the Earth Federation. His forces waged a final battle against the AEUG and Neo-Zeon for control of the world.
Of course, since he's the bad guy, Scirocco loses, but that's only because the AEUG captures a massive space laser and wipes out his fleet with it, and the resident hero, Kamille Bidan, spears Scirocco's mobile suit The O through with his Zeta Gundam. However, Scirocco was still powerful enough to dedicate the last of his energy to destroying Kamille's mind, reducing Kamille to a living vegetable after the battle. Even in death Scirocco gets to have the last laugh.
Scirocco is the last Earth Federation leader to show any teeth; everyone else after him are weak saps or nobodies who aren't even worth mentioning. His death marks the turning point of the Earth Federation forever being just a secondary power instead of a leading one.
Basically, imagine Thrawn mixed with Vader, with Adonis' charm towards the ladies.
