Came for the plot, came for the Plot

General story ideas. These probably make even less sense than everything else here. Just don't worry about it.

Things I want to incorporate
 * A world were technology is stuck in the medieval age and sword-fighting is done by many people. Primary antagonist would be a sword saint or something.
 * Brutus is summoned to another universe to help defend some people against some other people that can time travel, but because Brutus is from another universe he remembers everything from when they go back in time. The time travelers eventually focus completely on killing Brutus, but Brutus is eventually able to trap them and kill them.
 * A new universe were magic is very common. The magic uses an external mechanism, so Brutus can't use it without training, but enhancing still works. Magic becomes less effective as the user gets older though, able because Brutus is over 3000 years old, his magic is practically nonexistent. Magic users are however able to make a contract with a magical spirit and stay at a young age for their entire life in exchange for half of their lifespan. Brutus is summoned to this universe by an upset contractor who signed the contract when they were only 5 years old and have been living in fear of their life for over 10 years that they could die at any moment. His task is simple, kill the magical spirit that made the contract with the 5 year old kid.
 * In a world were body hair gives strength, neck-beards are the strongest warriors alive. Fedora's are the primary weapon used by these neck-beards and the most prestigious ones have their own waifu. The neck-beards are lead by the legendary White Knight who is said to have obtained Grizzly Infinium and wears double fedoras. I don't know how to implement this yet.
 * Once again, magic, but this time I want it to have a clan system. A summoning clan is testing new summoning methods and they accidentally summon Brutus. Normally summoned creatures can be dispelled, but they summoners are unable to dispel Brutus, so they try to kill him. Brutus isn't going to have any of that though so he escapes and is on the run for a while. Brutus eventually establishes himself as the most powerful person in the world.