Okay, here's some new ideas, they don't have a common theme, but who cares.

Doctor Who

Timey-Wimey, Scrambly-Rambly:
The twelfth Doctor doesn't know what happened, one minute he's in the Tardis with Bill about to go on another adventure, the next he's in a different version of the Tardis with old friends, on a adventure he already did. The same thing has also happened to his past selves. What is causing the Doctors to switch places in time? Who or what is trying to wreck the Doctor's timeline?

The Doctor and the Three Stooges:
Landing in the US in the 1940's, the Doctor meets three dimwitted men, and unfortunately for the Doctor, he'll need their help to save the earth. (Choose any Doctor for this story, but the Stooges must be Moe, Larry & Curly)

Doctor Who and the Holy Grail:
Crossover with Monty Python and the Holy Grail, the Doctor finds himself dragged along on King Author's quest for the Holy Grail, and finds himself in audience to the most unusual events that history classes never mention.

Scooby-Doo

Behind the Mask:
Weeks planning, costume designing, and hundreds of dollars spent to create a supernatural façade, all goes to waste thanks to those meddling kids and their mangy dog. 'Scooby-Doo, Where Are You?' from the POV of the creeps behind the masks.

Daphne's Most Perilous Dilemma:
What seems to be an average case for Mystery Inc. takes a turn when Daphne is kidnapped. But when the ghost is caught, they discover he had nothing to do with it. Someone had taken advantage of this mystery to take the gorgeous redhead, can they rescue her before something happens to their danger-prone friend?

Scooby-Doo Without Scooby-Doo:
What if Scooby-Doo never existed? What if the show was about four teens going around to solve mysteries? (Have you ever heard of that webcomic, 'Garfield without Garfield'? this is basically based on that.)

Scooby-Doo's Wewractions:
The Mystery Inc. gang find out someone's made a movie about them, several in fact, and let's just say they'll all need a Scooby Snack to get through them. It's the gang watching the live action films.

Total Drama

It's a Drama, Drama, Drama, Drama World:
During a reunion party, Chris gets an allergic reaction and on the verge of death, and in his final moments tells the former contestants that he has a personal case of $6,000,000 hidden somewhere in the US, and the group start a mad dash for the money. Of course, Chris faked his death, and tricked the teens into going on a treasure hunt so he can secretly film their insane antics for a new season.

Goodbye Goth:
Goth girl Gwen has never been friends with the school queen bee, Heather. One day, Heather shockingly invites Gwen to a sleepover, and by 'invite' I mean her flunkies kidnap her. Now held prisoner in Heather's house, the mean teen gives Gwen a makeover and promises by the end of the night, the goth will be gone, and Gwen will be one of them. (This is probably the most random thing I thought up)

Found Footage Fic:
Chris's attempt to make a new season with familiar competitors ends in mysterious disaster, all those participated disappeared and the season has never aired. One year later, Blainley has gotten her hands on the footage and plans to air it as a tv special to find out what happened to Chris and the contestants.

We've been 'Muppet Babied'!:
What are the Total Drama casts' reactions to finding out what their spin-off is?

Danganronpa

Kyoko Kirigiri: The Batlady:
Au with elements of Batman. Hope's Peak, a modern day city, was the opposite of what it's name implies, with crime rampant and murders a daily occurrence. Wanting to make a difference, Kyoko takes on the identity of Batlady to use her detective skills to fight crime, so her estrange father, the mayor, wouldn't know. But, a sinister presence behind a cute face wishes to turn Hope's Peak into a land of despair.

The Mage and her Lovely Assistant:
Himiko decides to get a regular assistant for her shows, and Tenko, the aikido master with a not-so secret crush on the tiny magician, wishes to take this role. No matter what obstacles get in her way, no matter how nervous she gets, and no matter how embarrassing the outfits are, nothing will stop her from becoming Himiko's lovely assistant.

Chihiro & Chiaki, a Cute Crush:
Chrihiro develops a crush on upperclassman Chiaki when she takes an interest in his programming. Of course having to pretend to be a girl, how can Chihiro be able to tell his feelings?

Ticklish Despair:
Junko Enoshima wasn't just the Ultimate Fashionista, or the Ultimate Despair, she was also the Ultimate Tickler, having the ability to tell where someone is the most ticklish. You maybe wondering how someone can be tickled into despair? Well Junko is gonna find out.

Batman

A Blue Idiot in Arkham Asylum:
Caboose finds himself in Gotham City on the night Joker takes over Arkham Asylum, and he decides to help his new pointy-eared best friend stop the mean clown. Can Batman survive this night with his sanity in check? Not just from the Joker's scheme, but from keeping himself from killing this blue armored idiot? (This is based on those RWBY crossover where a RWBY character finds themselves in Arkham Asylum, and I kind of hope this starts a trend of RVB characters in Gotham, annoying the hell out of Batman as they 'help' him.)

Batman's Bat-actions:
On slow days where there's less crime going on, Batman looks through videos and, isn't particularly thrilled with people's perceptions of him. Basically Batman watching videos or reviews that make fun of him, make him seem like a deep-voiced idiot that says 'I'm Batman' every five seconds.

That's all I have for now, I hope you like these ideas and really want to do them.