I really like the "collect them all" Idea with the My Melody and Kuromi! I have an idea like that, if you wouldn't mind me sharing it! If you have a lot of Evelution hats, you could (lets say) make five Umbreon hats, and have one of them be a shinny Umbreon hat. Them you could have a little hat or cup with papers with numbers one them (1-5), and have each hat have a number on it as well(1-5). Depending on what number a person picks would determine what Umbreon hat they get, so they would have a chance at the shinny hat! Idk if this would be a good idea in practice, but it's just an idea to have some RNG and a spin to getting a hat! Love your vlogs btw!