Ever since he was 12, Daniel Romano has cut a noticeable figure around Middle Village, a working class part of Queens. Mr. Romano, 20, who calls himself a Satanist, stands out, with his blue-tinted bouffant hairdo, his black clothing and fingernails, and the prominent crucifix, worn upside down. Mr. Romano has long been teased for dressing like a "gothic kid" or simply a "goth," in a community with small homes, neat lawns and populated with many Roman Catholics. But in recent weeks, two local teenagers began fixating on Mr. Romano, calling him names including "Satan worshiper," "baby sacrificer" and "hooker...