Leslie replaces Ruby Rose, who starred as Kate Kane, aka Batwoman, but abruptly departed The CW’s freshman superhero series for undisclosed reasons in May — leaving the show without a center.When it returns Sunday (at 8 p.m.) for Season 2, “Batwoman” will follow new character Ryan Wilder (Leslie).“I think [audiences are] going to love the character,” Leslie, 33, tells The Post. “Ryan is a very relatable character, and I look forward to fans seeing themselves in her.