Joe Hill, the character introduced in Season 10 of "Blue Bloods," has become a fan favorite due to his link with the Reagan family. Fans have noticed similarities between Joe and his uncles, particularly Danny and Jamie. Joe's emotional nature and struggle to fit in with the Reagans have drawn comparisons to Danny's hot-headedness. On the other hand, similarities between Joe and his late father, Joe Reagan, have also been noted, with the Reagans trying to protect Joe from following his father's reckless path. Overall, fans appreciate Joe's complex character and hope to see more of him in Season 13.