Como confirmado pelo OP nos comentários, este é Unico na Ilha da Magia
In this film, Unico meets a kind-hearted young girl named Cheri (also spelled "Cherry", voiced by Sumi Shimamoto). Cheri's older brother, Toby (in Japanese, "Torubi", voiced by Shuichi Ikeda), is working for the evil Lord Kuruku (in Japanese, "Kukuruku"), who plans to turn all living creatures, animals and people alike, into unusual zombie-like beings called "Living Puppets" to be his slaves; Toby's job is to change people into Living Puppets and then lure the Living Puppets to Kuruku's island castle in exchange for learning more of Kuruku's magic. His plan is to obey and serve until he learns enough to be the master, but fails to protect Cheri twice. Toby also takes on Melvin the Magnificat ("Yamaneko" in Japanese) - who hates Unico because Unico "intruded" in "his" forest (the forest in which the West Wind left Unico) - as his assistant. After Cheri's parents and neighbors all get turned into Living Puppets, she and Unico team up to stop Kuruku.