character information
Name: Isamu Nitta (western name order)
Fandom: Shin Megami Tensei III: Nocturne
Gender: male
Age: ~17
Time Period: point of death, with the player supporting the Musubi Reason
Wing Color: black/dark gray with reddish-brown hues on about a third of it as seen here
History: Megaten Wiki
Personality: The Isamu we see at the beginning of the game is a rather cheerful and cocky person who berates the main character for being late and claims that the MC's only purpose there is to set the mood. (Though he's probably not entirely serious, as he's a little friendlier once the MC actually arrives.) He's individualistic, which you might be able to tell from his taste in clothing (those shoes!) as well as how he's always going off on his own. Despite this, he's also easily willing to dump things on the shoulders of others - usually the protagonist. Never once does he come to the conclusion that he and someone else can handle a matter together. (Even later, if one chooses the Musubi path and sides with Isamu, either he'll do something or he'll make the protagonist do it. Never both of them at the same time.)
When he becomes fed up with failure and works his way into the Amala Network, he loses what happy-go-luckiness he still had, developing the Reason of Musubi, which would create a world solely based around the individual - where no one would have to be bothered by anyone else. (Yuko Takao seems to have been forgotten about entirely.) He becomes a bit more cruel, and if the protagonist doesn't side with him he mocks him for his soft heart. Unlike the Yosuga and Shijima Reasons, which are backed by demons that have sided with that cause, Isamu goes it alone. There are demons and spirits that ascribe to his way of thinking, but they aren't directly under his command. The protagonist will gain points toward the Musubi ending if he ignores others, and of the options given it fits most deeply into the neutral spectrum of the usual Shin Megami Tensei Law/Neutral/Chaos divide.
Arriving in Luceti, he'll believe that Naoki is still on his side and, despite the Reason he tried to bring into being, rely on him to help him out in this new environment. Without any power to back him, or Kagatsuchi enforcing the need for a Reason in the first place, he will become confused and probably think over some of the things he's done, eventually becoming more like the person he was at the beginning of the game. He won't be all that willing to interact with others at first, but I'm fully prepared to force interaction upon him.
Strengths: While lacking in the physical department, Isamu can be especially resourceful. He manages to get places on his own that the protagonist needs a full party of demons to get to and collects information on his own that the protagonist has to hear directly from the source. When arriving at the hospital at the beginning of the game, you find that Isamu has gotten hold of a key card that allows access to the lower levels - despite the fact that the building is otherwise abandoned. He also seems to have a knack for puzzles and/or codes, given how well he figured out the Amala Network, and possibly an affinity for magic. That was the strength of Noah, at least - the ability to change the sort of elemental magic it used and was protected from, with no set element it was better with. (Noah is actually the strongest of the three gods of Reason that you have to fight, despite the fact that somehow Chiaki's beats him in the Musubi ending.)
Weaknesses: Isamu is a solo player in an environment better suited to grouping up. He has a tendency to go off and try to take care of things on his own, but then when he fails he places the blame on someone else - usually the main character. He's often selfish, not taking into account the feelings of others. This isn't to say he doesn't care for others, as he clearly considered Chiaki and the protagonist his friends before everything went downhill, and he certainly cared for Ms. Takao seeing as trying to help her on his own was what originally got him into trouble. Despite his desire to take care of everything on his own, he also doesn't like to get his hands dirty if he can help it. If he fails to do something, he'll try and leave it up to someone else. Even with the powers he gained, he is incapable of realizing his Reason on his own (leaving it up to the protagonist in the case of the path I'm taking him from).