Well, I have an idea for the main character, if Star Trek Admiralty is ever happen.
Basically, the character is a masterful strategist. He loves the art of war, and even consider every war that happened in history as something very spectacular, and worth to be studied. But, at the same time, he's a coward. Or at least, very traumatic with a dangerous experience that happened when he was a captain. Because of that psychology problem, he should to be retired from Starfleet. But because of his brain capability, then Star Fleet raise his rank to be an admiral to work as their strategist in Starbase 01.
This character is a bit weird. Love to compare himself to the greatest generals in history, like Napoleon, Sun Tzu and the others. And when he managed to solve Starfleet problem, he call it as an art, and amazed with the beauty on how he solve the problem. But, he hates to face the danger / conflict with his very own person. He'll be protest if Star Fleet send him to the front line. And his psychological sickness will kick his brain when the ship is in danger, and must face a space battle against the enemy. So basically, this character hates to face a dangerous situation directly. But because of his way of thinking, it is himself who actually can bring troubles into his face.
This character lives in the worst time of Federation. After the Federation - Klingon war in 23rd Century, and looking at the conflicts that Federation must face at the time between Kirk era and Picard era. And his work, something that he call as the blueprint to build an Empire will make Federation one of the biggest powerhouse in the galaxy in the 24th century.