Aragami Mitsuru - Rindou (Radical Dream)/Shin Matai Toshi [w. Tentacles]

The character Aragami Mitsuru - originally drawn by Rindou (Radical Dream), featured in the doujinshi "Shin Matai Toshi"

I got the best results using AAAAutism. If you want a more realistic looking theme, you can use Incursio's Meme Diffusion (You can see it in the given images).