Say goodbye to that dancing creepshow named Mr. Six. Daniel Snyder, owner of the Washington Redskins, is fixing to deep-six the strangeling octogenarian that for years now has served as the chief mascot and marketing engine for troubled Six Flags Inc. Snyder, who took control of the theme park operator earlier this week, is planning to rebrand the Oklahoma company so it better appeals to children and families, the New York Post reported. That means steering away from “thrill-seeking teenagers” and establishing partnerships with fast-food restaurants and cartoon studios, the Post said. Branding experts say the odd-looking Mr. Six —...