This one really surprised me. It seemed pretty weird at first - Arthur? Oh surely not, we've already had Jack the Ripper, what is this, Voyager? etc.
But wow, what a story that unfolded, and who of all the men it should turn out to be.... but the very man who accidentally started the Earth/Minbari war.
I can't even imagine the feelings someone like that would go through, to have compassion and to have started something like that.. the remorse, the regret, the "if only"s, and he was just a good man who was mistaken.
I'm pretty sure it'd have driven me to insanity too, and also that desire to just help anyone and everyone possible. But ultimately, the need to be forgiven. By our equally compassionate Minbari and then, by himself.
A powerful bit of fleshing-out for the backstory. Great stuff.