THE UNLIMITED Hyobu Kyosuke: Lucky you! You're now an esper for (however long Anon decides) Your psychic powers are also dependent on the anon.
Magi: Look at you with your mystical genie pants. You are now a djin trapped in a magical lamp! First on in your askbox to say "Let me take a gander at this lamp" is your master for the next three days. You have the power to grant whatever wish they please as long as it's not world domination or the complete annihilation of the human race.
Naruto: Whoa! Pointy ninja stars galore! You are now a jinchuuriki and hold one of the 9 tailed beasts within you. Your powers are directly related to the demon locked within. Make sure not to lose yourself in the madness or your demon will take over! Gasp! This lasts for (Anon decides how long)
KHR: Left on your doorstep is a note and a pair of gloves--Congrats! You are now a mafia boss for (However long anon decides). It's up to you, in that time, to recruit members for your family and make yourself a name in the mafia underworld! Good luck, and don't get killed.
AMNESIA: You lose your memory for five days and the only thing you have to your past is a cellphone with five names that the Anon decides.
Pokemon: With your loyal partner by your side (your choice) You're off to challenge the world and prove yourself as a pokemon master! You challenge pretty much everyone who comes your way. Oh, and you're forever 15 since Ash apparently never ages.
Ixion Saga DT: Oh snap! You've been trapped in a video game of your choice for the next three days! You see the world as you would in the video game. Princess to save. Monsters to beat. Booty to claim! Plot twist, there's no restart button.
One Piece: Oho mateys! And welcome to your new life of debauchery on the open seas! For (however long Anon decides) You're a pirate! And not just any pirate--a pirate captain with the ability of a gum gum fruit (also anon's choice). Go find your crew! Sail the seas! And get that booty--aarg.
Fairy Tail: You now either wield the power of ice, fire, or celestial keys (Again, the anon's choice because it's so much fun to give them all the power). With your new powers at your disposal I do hope you don't try to take over the world--that would be terrible.
Bleach: Holy shit! Is that a hole in your stomach?! Hot damn, what's that sword? Wow! For the next four days you're an Arrancar if an anon sends you "Hole" and a Shinigami if an anon sends you "Death".
Kuroko No Basuke: Watch out world, here comes the Reincarnation of Micheal Jordan! For the next three days you have the skills and personality of whatever color from the Generation of Miracles the anon gives you. So if you're Blue then you're a shadow like Kuroko with excellent passing skills. Green you're a little tsundere like Midorima with awesome 3-pointers--and so on.
Cuticle Detective: Wow there, man. It's just hair. No need to drool a river. For the next three days you're a detective werewolf with a fetish for hair! You also like to pee on fire hydrants but that's highly irrelevant.
Kuroshitsuji: Put on your best coat, your nicest bow tie, and brush up on your cooking skills because for the next week you are someone's demon servant! Ooo, sexy. Your contracts either falls on your left shoulder blade, your left arm, or right over your heart. First person in your inbox after this activates is your master. Enjoy~
[K]: Based on a color, you are now a King! Silver, Blue, Red, Gold, and Colorless. You now have the powers of these kings and can add people to your clan. Just don't die and have a whole fandom cry over your death.
ATLA: Man, what a nice nap. Wait. What? You've been asleep for 100 years? For the next four days you are now the avatar--master of all elements! You can either kick ass and defeat the Firelord or work on your marble trick--whatever floats your boat.
Fruits Basket: Happy birthday--with a twist! Whatever Chinese Zodiac you are is now... well, you! You turn into your Zodiac when you're scared, sick, or kissed. But you also have the power to do so voluntarily if you really want to.
Uta No Prince Sama: Brb, Swooning! For the next week you believe that you are a popstar idol and your voice is one of pure perfection! Plot twist, the anon picks one of the lovely male characters from the show and that, my friend, is your new personality.
Skip Beat!: Lights. Camera. Action! For the next three days you are a very talented actor, a real diamond in the rough, ya know? Bad side? Well, you now hate love and normally can't take a flirtatious hint even if someone threw a rock at you and called you cute. Don't worry, it's only a phase.
Mermaid Melody: Under the Sea~ Under the Sea~ Life is the bubbles and for however the anon decides, you're now a mermaid! Your tail comes out when in contact with water and you have a lovely voice to boot.
Shugo Chara: A dream is a wish your heart makes, even though that has nothing to do with this anime. However, based on your character's goal/dream, you now have a little chibi chara floating around that represents your muses 'would be self'. Your also get the nifty little treat of being able to transform and have powers. Powers are up to you, but make sure they logically coincide with your Chara. Don't be a poophead.
Tamako Market: Achoo! You have now been transformed into a rather plump, talking bird! Whoever sneezes on you has officially (in your head) confessed their undying love towards you!
Death Note: Hey there you crazy sociopath, you! Look what Lady Death has brought your way? No. It's not your one way ticket to Hell (well, not yet anyways). Say hello to your new Death Note! You can use this to take your math notes, or wreak havoc by killing off people you don't like. Plot Twist. You can only use the book once so be wise~
Dragon Ball Z: KAMIHAMAY-FREAKING-HA. Look at you all spiffy in your orange gi~ And what's that golden cloud following behind you? For the next week you have Golden Nimbus to fly around and, I don't know, do cool stuff with.
Tsuritama: BIBIBIBIBIBIBI! Yes, you are now an alien for however long anon decides! This means you will transform into a fish, and you have telepathic and mind control powers! Just remember your daily dose of water, or you'll dry out!
Clannad: Dango. Daaaaango. Daaaaaaaaango. Yes, do cry, because for the next week you're goal is to do everything in your power to make seven people (of your choice) happy. Complete their dreams. Give them something they desire. Anything. And which each goal complete, you gain a little star used to grant you one wish. If you want you can go back and rewatch Clannad so you can cry and stuff but the emotional torment is only optional.
Vampire Knight: Oh you! What sharp fangs you have~ For however long the anon decides you are now a vampire of a certain class (anon also decides class). Based on that class, your personality severely altered. Try to control your animal urges and don't kill too many people.
Beezlebub: Whoa there! Look what the stork left you~ A demon baby for you to love, nurture, and possibly grow so it can one day take over the world. Have no fear, though, you only have to deal with it for a week~ Oh yeah. If you get it mad it will electrocute you. Shocking, right?
Death Note: You are now gifted a notebook! Great, now you can take awesome notes in it, right? Wrong. For the next three hours you now have the ability to kill off whoever pisses you off! Isn't that lovely?
Full Metal Alchemist: See? This is what you get when you try to bring things back from the dead. For as long as the anon decides, your soul is forced to reside in a suit of armor.
Sailor Moon: FIGHTING EVIL BY MOONLIGHT! Guess what! You're now a Sailor Sentai! Awesome, right? Male or female you must wear the proper uniform. The anon picks which planet you represent. So if they give you the moon you better believe you're the moon. Venus, you're Sailor Venus. Fight evil and save the world, okay? We only have like.. one of those.
Junjou Romantica: Unrequited love is really painful... Another person must feel sympathy for you and cheer you up within a week's period! If someone cheers you up in this period, you are now head-over-heels in love with them for as long as the anon decides! If no-one comes to your aid by a week, the anon must choose who will be your lover!
Lovely Complex: UMIBOUZU!! The anon decides who your best friend will be! However, there's a catch: You will eventually grow romantic feelings for your best friend in just 2 days! You HAVE to find a way to make them love you in return!! The anon will decide how long this process will take. Use those breasts of your soul!!!
[[Feel free to add more if you wish alkjdflasdf]]