Oof, that's a hard one. If they have to be dead, I'd choose Marsha P. Johnson and Sylvia Rivera, two transgender women who helped lead the historic protests at the Stonewall Inn, and Whoever started the whole Campaign for gay rights. I think it was George Cecil Ives, I mean that's who came up when I googled "who helped decriminalize homosexuality". So yeah. I'd love to show them how far we've come, and also find out what they think of where we are now in society.

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If you asking about alive or dead Historical figures then I'd choose, Bernie sanders, Malala Yousafzai, and Greta Thunberg.