So, here is my next idea of a fanfiction that should be written: an Optimus Prime and Paw Patrol crossover.
Now this is one I've been thinking about for some time and I'm stuck to one idea of how it could work (other then my usual other dimensions idea)
It involves that the decepticons have built a special space bridge that can travel between dimensions and is built for only a 'con to go through, any 'bot could suffer great wounds so Optimus (being Optimus Prime) makes it that only he goes through the bridge and ends up in vehicle mode, severely damaged and in the middle of the jungle where Carlos and Tracker find him (like in Age of Extinction)
After Carlos and Tracker call the Paw Patrol (along with Everest) they come to the jungle to see the mysterious truck, fix it up, and find it transform into Optimus.
After a little shock Optimus explains about himself and his kind (including as I'd like to put, a bit about the start of the war along with before he was a Prime), they decide to team up to stop Megatron and his 'cons (though I can see Optimus trying to tell them to not get involved as Megatron is way more evil then any villain the Paw Patrol have faced and I do believe this should involve the mighty pups).
Now, I do also see a good relationship between Optimus and the Paw Patrol due to Optimus being something of a father-figure to almost everyone around him as being known to have a great care for ALL sentient beings.
And that is my idea and I don't care which writes it or how many variations there are as long as at least one is good and not rated M and I'd LOVE to see some Ryder X Katie, Marshall X Everest and Chase X Skye.