[Rex] D1 needs more big families said no one ever.

Russet Rex

To say he was a troublemaker would not be accurate. He never intends to cause trouble, though he isn't exactly doing much to avoid it. Then again, his definition of trouble isn't traditional, so he will always argue against the label. After all, trouble is only when the Peacekeepers are involved, and he hasn't done anything illegal, yet. For all that he hasn't broken the law, he sure enjoys bothering others, well, mainly his older sister (currently unnamed). It doesn't help that he is nowhere near being a quiet child, always wanting to be heard when he feels he has something to say. If it's important, then he's all the louder for it. When breaking news, or even trying to wrangle information out of people, he usually ends up being quite direct, and is often caught before pulling a joke on someone because of it. Often, he will lose things from both not caring enough to remember where he put them, or because he's just plain messy. His room looks like a tornado blew through it, but for the most part he can find everything. Unless it's important, then it just disappears into the piles.

TYRANNUS-HORUS 'TY' REX giant lizard rage

EDIT: Ok so I did this not having read the bit that said "a couple of sentences" and "an outline" so yeah just don't pick me if I've done a silly

Tyrannus cannot be called a time bomb, because he is so unpredictable that his family have begun to only be surprised by him when he is calm. His relationship with the rest of his siblings is strained, to say the least. Tigirius is practically his opposite, with arms bigger than his brains and warmth of heart enough to melt the frozen wastelands to the north of Panem. While Tyrannus has no reason to hate or envy him, he is sickened by how someone who is supposed to be the figurehead of their family could possibly be so very dull. Leo's intelligence is used in a very different way to Ty's, and some sort of jealousy emerges in the latter when he sees Leo excel in Career-training, and conversation. Tyrannus feels no superiority to his younger siblings, instead viewing them simply as other people – not close family – and pieces to manipulate in his schemes. Raja's battles for the sake of feminism bore him, because as she tries to prove that she is better than the Rex boys as a unit, she draws Tyrannus into the same category as his brothers, and he always argues that he is something totally different. The only person who he lets close to him is, of course, his twin. While he has never felt he can truly relate to Tarquin, there's something about the unbreakable blood bond between them that means Tyrannus wants to share more with him than just his face.

Tyrannus is a prankster, yet he only feels his tricks are successful when he reaps screams from them, and not laughter. He desperately needs to use his brains to cause chaos in his house, while still holding control over all the havoc, because he is so lacking in ability that it gives him a chance to truly be the master of his siblings. He doesn't have a superiority complex, nor some obsession with dominance, he is just as insecure as every other somewhere-in-the-middle sibling, and mid-training Career child. The niggling voice inside his head tells him he's nothing as he watches the rest of the Rex clan succeed in all their individual tasks, heading forwards on their paths in life while his feels like a dead end. They all have a place to be, a family role they fit into, and so his self-fashioned place is to act as the stumbling block in their way. He is the pitfall, the shadow and the snake at their heel, trying to hinder them so he doesn't feel quite so lost.

that's a great idea onyx said no one ever. So he's insecure in his abilities, because he's not that good at fighting or at school, and as a result he thinks the only way he can be good at something is by making everyone else worse. He does it through carefully planned pranks and not just random acts of violence because that way he feels like he is achieving something directly, not just through other people's sufferings. Yeah.

Julius Niehus?