Splintersagi

Splintersagi is the friendship ship between Master Splinter and Miyamoto Usagi from the Teenage Mutant Ninja Turtles fandom.

The Big Brawl
Splinter is being attacked by assassin's after the Battle Nexus championship, when a young rabbit samurai comes along. He sees Splinter in trouble and attacks the assassin's just as Splinter is grabbed by Drago. He goes to save him, but is caught as well. They are eventually saved by the Daimyo, the samurai helping Splinter up. Years later at another Battle Nexus, Splinter sees Leo fighting a familiar face. Daimyo tells him that it is Usagi, the same Samurai rabbit that helped him years ago.

Samurai Tourist
Usagi comes to the turtles world through a portal, the turtles all happy to see him. Splinter welcomes Usagi and Gen, and Usagi says that the honor is all his. After spending a few days with the turtles, Usagi prepares to return home, but not before offering Leo some advice. Leo doesn't take it, but Splinter thanks Usagi coming anyways. He had hoped that when he had asked Usagi to come he'd be able to get through to Leo, but to no avail. Usagi wishes Splinter luck on getting through to Leo, and returns with Gen to their home.

Fanon
Splinter and Usagi's relationship is not the most explored relationship in the TMNT fandom. Most versions of the turtles have never had Usagi and Splinter interact. The version that has been seen the most is in the 03 TMNT series. Many fans are also Leosagi shippers, and have them interact with the ide that Splinter is Usagi's future father-in-law. Splinter often giving advice to both Leo and Usagi about their relationship in these types of fics. Some fans joke that Splinter having Usagi come to get through to Leo was basically calling his boyfriend for help. As well as it being seen as approving their relationship.

On AO3, there are currently 2 written works.

Fandom

 * FAN FICTION