Raidou and the other Kuzunohas are descendants of Abe-No-Seimei/ the Kitsune Kuzunoha
Raidou is the first in a long line of detectives, warriors and all around geniusesRaidou being a reasonably attractive male would theoretically have no problem reproducing, This being Shin Megami Tensei I think it's safe to say he did. However when someone as awesome as Raidou reproduces...well you know what they say. Therefore it's not to much of a stretch to say that many SMT characters and characters from other series as well, could all be decended from Mr. Kuzunoha. These include but are not limited to. Naoto Shirogane, Arisato Minato, Benjamin L Lawlett, Ed, Shawn Spencer, Robert Goren, Solid Snake, and Travis, Henry and Jeane It would be quite possible for Raidou to be an ancestor of Naoto, in fact it's somewhat impied, and since Fanon says that Minato and Naoto are related it's a simple use of the transitive property to say he would be the Ancestor of Minato as well. As for L, well he's a great detective and despite one massive freak out takes the exsistence of Shinigami fairly well implying he may have some subconscious familiarity with the surreal. Both of these traits he would have inherited from Raidou. As for Ed, well a small group of fans have specualted that Ed and L are related, so the transitive property from above also applies. For Robert and Shawn there is the fact that both are incredibly astute detectives and the later mentioned may or may not be a psychic. Now if the problem of two red blooded american boys being descended from a Demon Hunting Ninja strikes you as odd just remember there was at least one female american who came into contact with Raidou, and Raidou being a SMT Protagonist, it wouldn't be to much of stretch to say the least. With Snake it's equally justifiable in that one of his biological mothers (yes plural) was Japanese. Snake has a knack for Fire Arms to say the least and is rather quite astute both traits once again could have been inherited from his Kuzunoha ancestry. As for Travis, Henry and Jeane, their nationality is ambiguous enough and in a universe like No More Heroes you don't need much justification for Wild Mass Guessing. And while were on the subject, I suppose it's worth noting Dante and Virgil of DMC fame may be a Kuzunoha descendent as well, Dante and Virgil are both sons of Sparda, a demon who "Awakened to Justice" now this may be entering on squick but being Devil Summoner Raidou has many female demons at his beckon call and the idea of him hooking up with any one of them is lampshaded to say the least. Now Sparda could be the byproduct of one of Raidou's Demon conquests, and his human blood is what caused him to "Awaken to Justice". This would make Sparda and both of his sons Kuzunoha Descendants as well. (This theory is complete crack.)
Gouto's crime was becoming immortal/extending his lifespan.
Shinado is Philemon/Nyarlathotep.
In the end of the first Raidou game it was Yatagarasu that rested on Raidou shoulder as he went to his next mission not Gouto.