Well I do have ideas I wrote down for a story (a love story though, between Indra and my OC, but I can't really get any good ideas for a story and I don't want it to revolve around only love, want to put action in it, I'd want it to be as close to realistic as it would be for a story of Indra and Ashura as possible, but I don't have enough information to do so, my OC isn't well developed either) I'm just having difficulty figuring out his character because I know he has similarities to Madara and Sasuke but he started the war, after being tempted by black zetsu after losing in a fight for ninshuu, I think Indra created ninjutsu (the sage mentioned something to naruto stating that he didn't create ninjutsu he created ninshuu, and that ninjutsu was created for war).
He had to of started a family before going curse of hatred and then continue a war he starts until death, while Sasuke stops being curse of hatred because of Naruto before starting a family (which Ashura probably was trying to do the same with Indra but couldn't which is another difference in their characters). Which is kind of opposite of Indra, who probably started his family before going curse of hatred, instead. Indra remains curse of hatred despite Ashura probably trying to do what Naruto succeeded at with Sasuke, getting him to stop being curse of hatred.
Madara goes curse of hatred from the loss of his brother originally, where Indra doesn't lose his brother (leaving a question as to why he goes curse of hatred, it has to be from deep pain caused by loss of a loved one, like with all Uchiha, he started the clan after all lol), Indra instead battles his brother until he dies and unlike Madara, I doubt he secretly survived. But the monument was altered to provoke Madara like Indra was (guessing whatever was said to Indra by black zetsu was after he lost a loved one), this might mean what was on the monument was similar to what black zetsu did or said to tempt Indra.
Indra probably was after power like Madara (Sasuke originally wouldn't even take his brother's eyes until later. Sasuke was also originally called to soft because he wouldn't kill anyone, just knock them out, stating "they're not the ones I want to kill"). Guessing Indra was after Ashura's power, or whatever power the sage gave to him and not to Indra.
But all in all, this is predictions (and you never know with Kishimoto) and it still doesn't say about who Indra would be as a person, making it hard to write a story and capture his ambiance as a person, it just shows that there are definitely differences between Indra and who he reincarnated into, guessing it's the same for Ashura.
Kishimoto actually had a brilliant idea with coming up with these characters and could do so much for a great back story of them, even unpredictable things, that would give way more to the story, and keep readers interested even now (like where did Kaguya or the Otsutsuki clan come from, they are aliens from another dimension, but where and how did they get there if Kaguya hadn't eaten the fruit yet? What powers did she possess as an alien before eating the fruit?), not sure why he didn't really even go into it... I remain hopeful lol
