What is the origin of Sanrio Gemini?

One of the old characters. Gemini, born in 1975, is a cartoon character created by Japanese Sanrio company and one of the old characters of Sanrio. They come from distant planets. My sister's name is Lala. She is a little timid and likes painting and poetry. My brother's name is Kiki. She is a curious little boy who loves to invent.