He was very useful in Suikoden 2 and look cute, despite of his attitude with arrogant when talking.
He died in Suikoden 3, I feel pity for his fate, he's been helping in Gate Rune War and Dunan Unification War, he might have the same fate in future war.
I heard rumors before saying that this actually is not the ending that Murayama Sensei want, the final will be related with Hikusaak.
If so, in the Suiko world of Murayama sensei's mind, Luc is alive after defeated by other rune bearer, then he will turn to his brother side and fight against Hikusaak at the end, I guess.
By the way, do everybody like this ending (Death of Luc)?