Francis it the real Ninja of the party use Dexterity as a main point, he strikes fast, uses poisons and staggers your opponents to slow them down. He can easily avoid many hits by his high evasion score.
His biggest flaw is the lack of hi-damage powers and a low Mp pool. He is also the cool and collected one in the party
Using him as a leader you can boost your team speed and/or evasion.