>>>After discovering immortality
Wonder if that could be re-phrased better. ?How does he discover it? ?This is obviously the inciting incident that kicks the whole saga in the pilot episode. ?So it has to be a good one -- and one that inducesa viewing audience to suspend disbelief.
>>> a former African slave
Wouldn't it make for a stronger pilot episode and story line if he becomes immortal while still enslaved and the through line for the 1st season would become his struggle to win his freedom. ?(And freedom for his family? ) ?I'm assuming that becoming immortal has conveyed no other boon or power, so he would have to wrestle with obtaining his freedom like mere mortals.
>>filled with anger
Isn't that so obvious that it doesn't need ?to be said? ?Or is subjective need to somehow, over time, transcend his anger? ?His anger can serve as a two-edged sword of emotional motivation. ?There is plenty of cause to be angry because there is so much injustice and oppression. ?But on the other hand, if not tempered, it can lead to rash behavior and self-defeating consequences. (And the character has to be flawed; even though fighting to overcome evil, he's can't be portrayed as a saint.)
Anyway, overall, I suggest the logline needs to frame his objective goal more directly: to wit, to obtain his freedom and fight for the freedom and equality for all his people. ?(That is his long term objective goal, isn't it?)