A/N: Just a random idea. I figured that I'd start with Dumbledore and work my way down. The amount of things will vary with each character. I don't own Harry Potter.
When he is three, and he has a new brother, he is ecstatic. Until that new brother takes away his parents' attention.
He thinks he'll feel the same way when he is nine and his new sister is born. He's wrong, because Arianna doesn't like anyone except him and Aberforth. In fact, the two of them fight over her more than anything else.
When Arianna is attacked, he is suddenly repulsed by the sister he had once loved.
He hates his father for going to prison and making them move, making his mother so stressed and not being there.
He and Aberforth fall apart after that. His brother is never repulsed by their sister, and he berates Albus for not going near her.
He rarely tells anyone his first middle name, because it is his father's first name, and he hates his father.
When his mother dies because of Arianna not being able to hold in her magic, he chooses to stay at home with his sister. Many, he knows, think that he is being forced, but the truth is that he isn't repulsed anymore.
When he meets Gellert Grindelwald, he is amazed. He never knew that he could find another like him. One with huge dreams they would never put a limit on.
Then, Aberforth brings him to reality when he says that he can't have Arianna tag along with him and Gellert. He hesitates, then Aberforth is screaming on the ground. He draws his own wand, and the fight begins.
He hadn't noticed Arianna come up from her basement bedroom. If he had, he would have stopped the fight, so that his sister would be safe. Instead, he and Aberforth are dueling with Gellert, and one of Gellert's spells misses his shoulder by and inch, and hits someone standing just behind him. When he hears her body hit the floor, he spins around. She his holding their mother's old wand, although he never knows how she got it.
He tells everyone, as does Aberforth, that he doesn't know whose spell killed Arianna. They know, all three of them do, because Gellert, the man Albus fell in love with, had been the only one firing off Unforgivables.
He knows that Gellert has the Elder Wand, and that that wand killed his sister. So, he finds Gellert, and defeats him, although he doesn't kill him. So he becomes the Wand's true master.
He loves teaching. He tells any who ask that he does it because he doesn't want to be in the Ministry, that he can't be trusted with power, and it's true, he can't be trusted. But he enjoys teaching young minds more.
When he meets Tom Riddle. He sees great potential.
When the sixteen year old Tom Riddle, blames Hagrid, a Gryffindor, for the opening of the Chamber of Secrets, he sees a potential for horrible things.
When James and Lily Potter told him they were putting their faith into Sirius Black, he doesn't see the charming, loyal Gryffindor. Instead, he sees a Black, true to his family, and back in their good graces by following Lord Voldemort.
When he discovers, years later, that he wasn't the spy, he is ashamed. And when he apologizes, Sirius accepts without a fault. But his cousin Nymphadora does not. She shouts that he should of made sure, not paid attention to just a name. he apologizes and hugs her too, then apologizes to Remus Lupin, because he took another friend by not defending Sirius.
When Harry came out of the Triwizard Maze clutching Cedric's body, he knew before Harry told him. He knew Tom Riddle, now Lord Voldemort, had returned. And he had expected the Ministry to overlook his return for a more sturdy public front.
And a year later, when Cornelius Fudge finally knows, he tells him everything, except for the Prophecy.
And then he has to go and tell Harry about him being chosen to defeat Voldemort. Harry Potter's anger is not unusual, and it is not the first time his office is destroyed. In fact, during the first war, when he had to tell Order members' families of their deaths, many of his possessions are shattered repeatedly.
During his private lessons with Harry, he sees James' determination to do right by the world, no matter the cost to him. And he sees in him Lily's determination to save anyone he can, to make sure as little people as possible are hurt.
He sees that fight when he drinks the potion on that island. He sees Aberforth on the ground, in pain, under the Cruciartus Curse.
When Severus approaches him, he begs him, because of their deal, and he is afraid he'll break it.
The jet of green light hits him, and suddenly he is in a meadow, with his mother, father and sister, and they are running and laughing.
He watches with Lily, James, Sirius and Cedric as the war escalates to terrible heights. He has never seen James so upset as when Remus took the curse for his wife, so that she might make it home, only to have her fall moments later, after Bellatrix's laughter.
When Harry faces Voldemort and takes the Killing Curse, he goes alone to meet him, so that Harry is not tempted to leave the world behind.
He weeps when Harry names his son after him. Severus is appalled. The rest are amused.