While we're not told too much about the personage of Titus Mede in the new Elder Scrolls novel, there is a certain passage I find interesting on page 108:
Titus Mede had been - and was - many things. A soldier in an outlaw army, a warlord in Colovia, a king in Cyrodill, and Emperor.
I find the part about an outlaw army very interesting. What should we assume that means? I detect subtle duality at play here - we can either read it as him starting out as a resistance fighter in an illegal army to combat the official government ran by the Council post-Oblivion, or we can take it more literally and assume he was some sort of bandit or marauder. The former is the far more likely scenarior, but is boring to me and therefore wrong in essence, but to imagine that the new Emperor was at one time quite literally a Thief is intriguing indeed. Perhaps he, like his son Attrebus, was never that great a fighter at all and depended on better men to cut a path to the throne. If that were the case he shares characteristics with Lord Vivec, and Talos Stormcrown himself.
Or perhaps Attrebus is the true Thief, and in the tradition of Martin Septim is destined to be a far greater man than his father in the end? Perhaps Mede was the Warrior and his son the Thief - but who is the Mage in this equation? I might be reading too much into this but at this point I look for these patterns in the lore.