Sanrio Unico Plush
Available in 1984, these Unico plush came in multiple colors. As you can see from the photos, the light blue and pink both have a rainbow horn. Since Unico in the Island of Magic was in theaters around the time these were released, a lot of the merchandise features rainbows. Seeing multi-colored Unico plush is actually quite fun and unique!
You can see more photos of these guys on unicolove’s Instagram.