Tsunami, yeah, no one from PSII; I'm saving Amy for a Healer showdown with Raja!
In a bit of an upset.... I choose Lyle! Rune is a cooler rehash of Noah, (eliminating Noah) and is utterly awesome in combat, and even has a surprise twist in store for the player, but I still side with Lyle. There isn't much going for Ryan other than being the only character in PS with sunglasses!
My argument for Lyle: he's very strong, has some nice Techs, but it is his behavior in the game that wins me over. Call it the "mystery" factor. He leaves me wanting to know more, and therefore stimulates my interest. PSIII Spoilers!
He can turn into a dragon, but does not tell how he can do it! He abducts Maia at the altar, and keeps the secret from Rhys to the grave. He joins the party yet still stands for his country and fights Rhys one-on-one, only to rejoin the cause in defeat! The complexity of his moral struggle and victory in it had my full attention, but I still wanted to know more. That's why Lyle gets my vote.
"Impossible is just a word people use to make themselves feel better when they quit." Vyse, Skies of Arcadia Legends.