During the friendly creeper clip, there was another forgotten helper from the stampys Lovely world, captain sparkles, that you forgot to put in the video. Thought I'd give you that info. Even though he was probably only in like a few episodes. but he is still technically a forgotten helper in stampys world.
I remember two things from Amylee. First, she did a world with Stacy plays all on her own. Then I THINK she did her own world and had stampy joined. The second I don't remember as well.