My first one was an artist, (she quit around the time I joined as LavenderArts) named BadArtist. Ironic... because she was really good. She was the one who inspired me to stop making remixes and become an artist.
The second one was SereneSilver (which was Serenity's name at the time). Serenity is also an amazing artist and I loved all of the challenges she made for her art club.
And another important one, MagmaPOP. MagmaPOP made me realize that there was so much you could do with code and the point of hopscotch was to explore what you could make. Obviously, I'm not really a coder, but it inspired me to make a few things I had never tried to make.
Of course, I have more, but those were the first!