Elmo is a Muppet character on the children's television show Sesame Street. He is a furry red monster with a falsetto voice, who hosts the last full fifteen-minute segment on Sesame Street, "Elmo's World", which is aimed at toddlers.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.