You would use past tense to describe the trip to the pole. He was the first to reach the North Pole. Either is or was would work for the other sentence.
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zeroX14But it remains a fact that he's the first to reach the North Pole, hence why "was" ?It's because he's dead. You can't say he is anything if he's dead, unless you say he is dead.
zeroX14He IS the first to reach the North PoleYou may use it in the so-called historical narrative.
AnonymousYou may use it in the so-called historical narrative.Quite true, but how often does that happen? I can't remember the last time I used the historical narrative in reference to first-time events, if I ever did. That would normally come up only in history books written in popular style or in film documentaries, I would think.
zeroX14 non-fiction characters? I.e. Darth VaderI think Darth Vader is a fictional character, not a non-fictional character!