It's quite close. The anime of Inuyasha largely adheres to the manga, with only a few minor differences that don't significantly impact the main plot or characters.
He might also become more patient. Usually a bit hot - headed, but with Kagome pregnant, he'd have to learn to be more calm and understanding. For example, when Kagome has mood swings due to hormonal changes, Inuyasha would have to control his temper and be more supportive instead of getting frustrated.
Well, Prince Inuyasha fanfic varies a lot. Some focus on romance, while others explore action and fantasy elements. It really depends on the author's imagination and creativity.
The Inuyasha manga ends with a resolution of the main conflicts and a sense of closure for the characters. Inuyasha and Kagome's relationship reaches a fulfilling point, and the threats they faced are overcome.
Well, in the end of the Inuyasha manga, the conflicts were resolved, and the characters found their peace and happiness. It tied up most of the loose ends and gave a satisfying conclusion to the story.