There is only 1 day a year in which he truly HATES his parents. And that is May 2nd. Every other day of the year he understands why they went into Hogwarts that night, but on May 2nd, He just can't. He can't understand why they'd run in to certain death with a baby at home. He can't understand why they didn't stay with him. He hates that they left. He hates them for dying.
He loves his grandmother Andromeda very much but he much preferred staying at Harry's house. It was like Andromeda was his parent and Harry was his fun uncle. When he was at Harry and Ginny's he could do what he wanted (within reason) and could get treated like an adult rather than a child, like with his grandmother. Not to mention James, Albus and Lily who were basically like his brothers and sister.
It was 5th year when he finally stopped seeing Victoire as a little girl. They have been best friends ever since she was born, but suddenly and without warning in Victoire's 4th year she got her first boyfriend. Who Teddy HATED. He couldn't even describe the anger he felt when he saw them together and then it hit him. Victoire wasn't the 6 year old girl who begged him to change his hair to pink to make her laugh anymore. She was beautiful and pretty and attractive and his best friend. It took him a whole year to finally get his feelings for her straight. They started dating in his 6th and her 5th year of Hogwarts. They kept it a secret.
He hates his natural physical appearance. It reminds him too much of his parents from the pictures he's seen of them. He only ever changes to his natural appearance on the anniversary of the battle, and only Victoire has been allowed to see him on that day. It was his way of letting her know he trusted her more than anybody else.
Teddy was 16 when he finally found out about his father being a werewolf. It was from Neville as well. They were just talking when it slipped out. He confronted his grandmother and Harry immediately who only assured him that it was because it didn't matter. But since then he can't stop himself from noticing how irritable and angry he gets during the full moon. He tried to stop Victoire from being near him during the full moon after a horrible argument they had during one, the only time Victoire showed her full Veela anger. But Victoire refused to be pushed aside when he needed a friend.
The most annoying part of James telling their whole family that they were dating was that no one was surprised. No one except her father. Her father went ballistic and threatened to kill him until her mother calmed him down. Everyone else expected it, like they were just some sure thing to bet on. Teddy hated that.
Teddy's favourite lesson was charms, he had an exceptional talent for charms that impressed all his teachers. Despite his talent he preferred quiditch, he was a keeper and he often choose that over his talent. Much to the annoyance of his charms teachers. It wasn't until 6th year (with a lot of pushing from Victoire) that he realised he could make something of himself with charms. He got full marks on his O.W.L's and N.E.W.T's for charms and after Hogwarts went on to further education and became duelling champion.
Teddy wished he'd never told anyone at school he was a Metamorphmagus. It was during his first year, only a couple of hours after sorting that one of his fellow hufflepuff's asked why his hair was blue so Teddy replied 'Would you prefer it green?' and changed his hair. After that it spread through the school like wild fire, Hogwarts had got a Metamorphmagus. Everyone looked at him like he was so weird, he wished a lot that he'd never told anyone.
In all the Weasley/Potter clan (excluding Victoire) he was closest to Rose when they were younger. Rose idolized Teddy and followed him everywhere. He was even her first crush but Teddy never saw her that way. He only saw Victoire. This lead to Rose HATING Victoire for years until Rose was 18 and very much in love with Scorpius. Then she finally forgave her for taking her best friend and crush away.
He doesn't get angry (other than during the full moon) often, but he is defiantly the jealous type. He knows he is insanely lucky to have the most beautiful, kind, caring and all together wonderful person by his side. But he also knows there are plenty of other boys out there that want to be as lucky as him. Sometimes his jealousy makes him stupid but he can't help it, the thought of losing Victoire to someone else is horrifying to him.