It's not hard to see why Trey Mancini is such a fan favorite. He persevered as an overlooked prospect to earn a full-time role, plays out of position because first base is blocked by Chris Davis, has taken on a leadership role on a young team and has publicly stated he wants to remain in Baltimore.
Of course, it helps that Mancini is one of the Orioles' few homegrown talents who's any good right now. And he just put together easily the best year of his three full major league seasons.
After posting a surprising 116 wRC+ as a rookie in 2017, Mancini fell back to earth in 2018 (91 wRC+) as he played through a knee injury on a 115-loss squad. The Orioles were moderately better in 2019 (only 108 losses), but Mancini was on top of his game.