Fiamma resembles Touma more than his others eventual enemies, heck even both sounds similar, I hope to see this lonely guy returning as a main character and as Touma's main rival, doesn't need to be a villain. Also it will add fun seeing Accelerator going jealous that his ideal hero's rival isn't Accelerator himself
.
Accelerator wanted redemption and met Last Order at the begin of his path, Touma has various people he can call a friend, Shiage stood by himself and even got a girlfriend, but... Fiamma sure is now the most lonely person in this world...