Board Thread:General Discussion/@comment-26907577-20191002153041/@comment-35806478-20191031173255

"Flowey absorbs six human SOULs "While you guys were having your little pow-wow". But he doesn't immediately go Photoshop. He continues to look... like Flowey."

That's probably because when you have six SOULs, you have control over the shape of your body. Flowey can transform into both Omega Flowey and Asriel Dreemurr. Although those two forms have different SOUL amounts, I'm pretty sure the concept of Omega Flowey was invented by Flowey himself.