Thomen is a strong young blond guy from Sprohn. He's quite happy and cheerful, always willing to help a friend and looking on the bright side of things even when in dire times. Most of his friends believe this is due to Thomen being a bit too blunt to understand the implications of some problems, though it is not something they really wish to tell him straight.
From a young age he discovered he was good and happy with swords, the bigger the better, so he joined a clan and used his skills in the Clan Wars. While he's never been too much into Laws, he appreciates the secondary effects of them (not dying during a Clan Match), so in the end his approach is a kind of 'you there, me here' thing.
Prince Mewt's attitude, however, is something that most people of Thomen's environment couldn't chew. They didn't like his random mood changes and 'spoiled brat' behaviour. So when Thomen's clan mates heard about Marche and the crystals, they all were set on giving all the help they could. Unfortunately, about half the clan got red cards on their last mission rescuing a Nu Mou from the Lamiahs, and they were sent to jail.
After that incident, the clan dissolved, and Thomen was left looking for a new clan to join, a clan that would appreciate his swordsmanship and an opportunity to leave a lasting impression of himself in Ivalice (not knowing, of course, that Marche's triumph would mean the end of Ivalice itself).
Background set in FFT: Advance.
