Just a one-shot, that I won't continue at all, that I thought of after seeing these stories of what would happen if Kurama gained a body and raised Naruto.
Thought: What if Kurama spared Minato, the 4th Hokage, from death by giving him some of his chakra as well? Would the cost be worth Minato's sanity?
Warning: I haven't read the Manga past the issue before the older Naruto update way back when. But I don't remember much of the original, so please keep that in mind when you see it doesn't reflect the canon version at all.
Minato felt his strength fading him as he fell to the ground. In his arms was his son with blonde hair, calming down from the pain of having the spirit of the Nine Tailed Fox, Kurama, sealed insid of him. Minato smiled weakly at Naruto. "That's right Naruto, daddy's got you." His vision became darkened as his eyes closed in exhaustion. Maybe, maybe if he just closed his eyes for a few moments, he'd feel better.
Minato opened his eyes to see he was in a large room. All four walls were made of cement and it was filling up with water. When he looked up, he saw the Fox. It was laying down, it's nine tails folded around itself. The red eyes were staring at him and the fangs of the creature were revealed. Minato readied himself for a second round of fighting with the creature, even after he saw it was in a cage.
"Stop, mortal." It said, hiding it's fangs slightly. "I can do nothing in here. Nothing, except for strike a deal."
A deal? Minato softened a little. "What do you mean, deal?"
Kurama chuckled evilly. "A bit of my chakra, for a price. A bit of my energy to save you from dying and leaving your son as an orphan."
Minato grit his teeth. "What do you want in return?"
Kurama's fangs showed again, but in the form of a wicked grin. "To watch you lose your mind."
Minato gulped. "Alright.. But, only if you protect my son from me when I'm angry or from anything that will harm him, Fox. Swear to it!" He ordered.
Kurama nodded. "Very well, 4th hokage. Touch the tip of my nose, and we have a deal."
Minato reached forwards and put a hand on the tip of the beasts' nose. After a moment, white hot searing pain shot through him as well as a shriek while everything became darkness again.
Minato opened his eyes wide as he panted. He sat up and saw he was in the hospital ward. There was a crib in the room and he heard soft snores within it. Naruto was there, and thank goodness he was safe.
Minato felt pain in his chest, and looked down as he unbuttoned his shirt. On his chest was a large fox print burned into his skin. "What have I done?" He looked over to Naruto to see he had whisker-like markings on his cheeks, and that's when he knew Kurama would be watching through Naruto's eyes. Waiting for Minato to snap. But he wasn't going to. He had a reason to fight off the madness of his decision and remain sane. His son, Naruto.