Christopher Robin is a young boy and friend to Winnie the Pooh and the other inhabitants of the 100 Acre Wood. Missing for much of Disney Heroes vs Villains, he only appears briefly at the end of the war reuniting with the 100 Acre Wood team.
Though he appears imprisoned in an image shown to Pooh and Friends by Doctor Facilier, it is unknown if this was actually happening at the time, as Facilier had been trying to trick the heroes. It is still unknown why exactly Christopher Robin went missing in the war and whether he was captured by the villains, lost in the chaos of war, or something else entirely.