In order to get Maximillian as a champion for your paladin character, you need to have done his quests in Un'Goro Crater, starting with An Important Lesson and concluding with The Ballad of Maximillian.
Once you've done that, he should send you Letter from Maximillian in the mail. I didn't get it immediately, so I logged for the night and upon logging in the following morning -- there it was.
He'll send you multiple copies for some reason, however. ¯\_(ツ)_/¯
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