During the Carrows Reign of Terror, I see Peeves the Poltergeist playing more of a protective role to Hogwarts students instead of an antagonistic one.
I can imagine him aiding Ginny, Neville and Luna in their fight against Snape and the Carrows.
He’d distract the Carrows by smashing vases on their heads, springing students out of detention and help Ginny, Neville and Luna by graffitiing the walls with Dumbledore’s Army recruitment messages along with many rude messages insulting the Carrows and Snape.
To make matters worse for the Carrows, Snape turns a blind eye to it all by telling them to ignore Peeves.
By the time Ginny is forced to go into hiding, Luna is kidnapped and Neville is forced into the Room of Requirement, Peeves continues his one Poltergeist army against the Carrows and many students are willing to blame Peeves in order to avoid being subjugated to the Crutiatus Curse.
After the Battle of Hogwarts which Peeves’ long term Mischief making partner Fred Weasley was killed, Peeves was given the honour of guarding the coffin and he played an important role in the funeral when he swept his bell covered hat off and stood to attention as it was lowered into the ground.
George Weasley also presented Peeves with one of Fred’s jumpers which Peeves wore with pride. He continued to be his usual mayhem making self, but many students were aware of his role in protecting them during the reigns of Umbridge and the Carrows.