If you liked the Monochrome Factor anime, the Anime-Planet community thinks you'd like:
In a bizarre fantasy world, students known as meisters are trained at the illustrious Shinigami Weapon Meister University; but the tools they wield are no ordinary weapons! Each meister is paired with a human-like being who can transform into a weapon at will; and after defeating a pre-kishin - a human whose soul has darkened - the weapon eats the soul within it. A meister's ultimate goal is to collect ninety-nine pre-kishin souls and one of a witch so that his or her partner will become an all-powerful Death Scythe. Maka and her partner Soul Eater; Assassin Black Star and his partner Demon Blade Tsubaki; and Shinigami's son Death the Kid and his partners the Demon Twin Pistol Thompson Sisters each vie for their ultimate goal, but plenty of challenges and adventures lie in their way!
both animes revolve around spirits, souls, evil spirits. in both animes there are spirits who sometimes control people, and as they grow up inside of them and their hatred and sadness they become more powerfull. In both animes there are the good guys eliminating bad souls, trying to balance the world. those and the action, humor and drama on both animes will make you like one if you liked the other.
Their feel is very different but supernatural/shounen similar. Soul Eater is more comedic, but much more attracting. It'll draw your attention if you liked Monochrome Factor, I tried it and it worked!
Having recovered from a mysterious accident that caused him to suffer amnesia, Hashiba Sora is just starting to get his life back together. On the road to recovery, his steady progress is interrupted when he acquires a new roommate (who supposedly is his childhood friend), Fujimori Sunao. Their relationship becomes even more complicated with the appearance of Ran, an alternate personality inhabiting the same body as Sunao! Faced with the shadows of his past, can Sora regain his lost memories and make sense of what is happening around him?
Abandoned outside an orphanage when he was just a baby, Yuki is a boy with no idea where he came from or who he really is. Now in high school, the teen is plagued by odd dreams, death threats and an ability to see the negativity that dwells within people's hearts. One night after being lured into a trap, a mysterious and handsome man named Zess saves Yuki from being killed before disappearing into the night. Then, with the sudden arrival of his long-lost brother, the orphan finds himself pulled into a new world where he can not only learn about his powers and how to control them, but also becomes aware of the evils that lurk in the darkness. Can Yuki finally find the place he truly belongs, and just why is Zess so protective over the young boy?
Both of these stories revolve around a seemingly normal boy teenager. Both are confronted with a strange man. While the enconters are very different, both leave lasting impressions on the main male. Both of the strange men are protention love interests for the main male charater. Both the shows also involve the main characters fighting deamons that invade the darkness of people's hearts. Both also involve a shocking revelation about a friend of the main male. Both the main characters also find out that they have special powers that they were unaware of. While Monochrome Factor is less serious than Uragiri was Boku no Namae o Shitteiru both are very similar in their natures.
Both of the main story lines revolve around high school age boys who are leading seemingly normal lives until they're pulled into a world of darkness that they don't quite understand. Both are confronted with the fact that they have powers or will come into supernatural powers, both for similar reasons that I won't state so I don't ruin the plot. Both also have protectors/partners- Zess for Yuki and Shirogane for Akira- and fight alongside their friends. I think that if you liked one, you will probably like the other.
Sumire Takahana was a once normal high school student, until one day, she picked up a mysterious brooch and began to see soul-eating demons known as Virus. Now under attack, Sumire was saved by the owner of the brooch, Lucia, and Lucia’s Vaccine-loaded gun. However, instead of shooting the Virus, Lucia accidentally shot Sumire herself, turning her into a living antivirus. Together, Sumire and Lucia will try to uncover the secrets of the Virus before they devour all of humankind.
VVV and MF are supernatural tales with demons and people with superpowers; however, they are also both relatively boring. I strongly preferred VVV to MF, not only for subject matter but also for appearance. Regardless, if you liked one, you may enjoy the other.
Venus Versus Virus and Monochrome Factor follow the same pattern: normal student becomes empowered and fights supernatural creatures with the help with a team. The fact that these monsters possess human victims and that they are unseen by normal humans only adds more to the similarity between these titles. Venus Versus Virus is mostly a serious anime with female leads while Monochrome Factor is heavy on the comedy and with bishies galore.
In world where flesh-eating monsters roam the streets, only one organization has the means to save civilization from annihilation: Red Shield, a specially-organized unit designed to fight these monsters, and the only weapon that can destroy them: Saya. Awakened from a 30-year sleep, Saya is thrust into a modern world which she has no memories of, and is troubled by a past filled only with bloodshed and sadness. With the undying love and support of her family and friends, she struggles to gain the strength to move forward and regain the pieces of her shattered memories.
Both characters, Saya and Akira, are dragged to fight with monsters to save people. They both have a great story and great twists and a pretty dark mood but also some funny moments. Also in both series they have to fight to stablish a balance beetween two different worlds.