Francis is a knight of Escata loyal to both the House of Galeos and the royal family. He works for Basil Galeos as a personal bodyguard.
When Henri decides to travel with Laura instead of Galeos after reading the books in the Vaftom mausoleum, Galeos assigns Francis to watch over Henri and send correspondence with information about Henri's travels.
Laura accuses Francis of being a spy for Galeos, but Francis is unaware of Galeos's manipulation of Henri, and claims that he is keeping Galeos informed because Galeos is close to the royal family of which Henri is the only surviving member.
After Henri collects the Elemental Gears and gives them, along with the Blade of Escata, to Galeos, Galeos reveals that he was manipulating Henri to obtain the blade's power. Francis decides that his loyalty lies with Henri before Galeos.
Francis accompanies Henri to Nakle Lines to attempt to stop Galeos, where Galeos summons Chaos only to fall to Henri and be absorbed into Chaos. Francis assists Laura in defeating Chaos alongside Henri.
If the player loses the fight to Dagul Bos, Francis and the rest of Laura's party will end up fighting Dagul Bos at Nakle Lines instead of Basil Galeos.
In Ventus's scenario he appears at the beggining of the carrier mission and together with Ventus they go and catch the carriers that stole Basil Galeos' items. This recruitment is special since without a guide, not many players would figure out to do this carrier mission of all the possibilities and also because it's at the end not at all explained why Francis stays in the team.
Francis is built for Melee Arts that output the maximum damage possible. His high stats, high LP and low magic ability are ideal for tanking damage. His initial Growth Panel needs some work to maximize damage output (adding Axe and Melee panels) but the presence of a Shield Panel is a bonus.
Francis is quite special considering that regardless of being a secondary character, he did visit Nakle Lines with Basil Galeos. Also he does appear during Laura's ending.
Francis's battle quote against Chaos in Laura's story implies he may have knowledge as to the origins of Chaos, the game's final boss. However, he may have been referring to the power of The Seven Wonders, rather than Chaos specifically, at the time.