IMHO I see him much stronger emotionally on the show than in fic--
I think this is because in fics, you can explore the character meaning, what you see isn't all you get. Oftentimes, the strong, mature thing is just a front to hide a weak, scared person. At least, that's the stereotype.
Personally, when I write Seth and Ryan I have no idea if I characterize them correctly or not. I just make Seth say what he feels and Ryan only think it.
I think some portray him as much more self-centered and destructive than he really is
See, this is sort of canon because of his overreaction in the finale. Even if he was only sailing to Catalina, that plank of wood couldn't have been too safe.
Ryan isn't the Amazing Savior Perfect Boy an
See, it hard not to think of him this way because according to the show, Ryan always tries to save people, even putting himself in danger for it.