Mary VanArsdel Following Mary VanArsdel ’s rousing rendition of “You’re a D’Ysquith” on opening night at the 5th Avenue Theater, a definite friends and family cheer goes up from the audience. Currently in the national tour of “Gentleman’s Guide to Love & Murder,” her performances at the 5th will be her first time on a Seattle stage since 1987. “But I visit Seattle regularly,” she said in a phone interview earlier this month. “I have a huge network of friends here.” VanArsdel grew up in Seattle, attending the Bush School, and she returned here after college to star in the original cast of “Angry Housewives,” Seattle’s longest running musical hit. In it, VanArsdel played a punk rock cornflakes-throwing mama whose rendition “Eat Your F#@*ing Cornflakes!” became an instant classic. Locals also remember her wide-eyed Nancy Reagan in Gary Trudeau’s “Rap Master Ronnie” at the Group Theater. More recently, she has been touring the company in large Broadway musicals like “Gentle...