One common theme is mystery. Just like in the anime, fanfictions often explore the unknown elements of the twilight world and the secrets of the phantoms. Another theme is friendship. The relationships between the characters are developed further, showing how they support and rely on each other in different situations.
Partly true. 'Breaker Morant' takes inspiration from actual happenings, but there could be some fictional elements added to make it more dramatic and engaging for the audience.
Yes, the Wind Breaker manga is over. It's been a wild ride from start to finish. You'll find that the ending leaves a lasting impression and gives a satisfying conclusion to the characters' journeys.