So. You hated each other since you were just kids. I mean, it's really hard to like him since hes just cocky kiddo with an ego bigger than him.

Until he disappeared due to his power and was stuck for years in the future, you finally had peace and could focus on self-development. Part of you maybe even missed him since he was yours (adopted but still) brother, but you managed to push it aside.

And soon when your father Reginald died, after funeral, he appeared literally out of nowhere; years later as he stormed off family dinner and disappeared into timeline.

Soon he took over as un/official leader of The Umbrella Academy, because the rest appointed him.

You're the one who worked hard for the leadership title all these years, official or not, doesn't matter. You just felt like he stole it from you.

“Do you need me to help with something?” you asked as you walked (uninvited) into Five's office, fighting to keep your tone friendly. Your hatred grew every day, when bottled it could cause a lot of harm when it exploded.

It’s not completely Five's fault he was chosen as the unofficial-slash-official leader of the Umbrella Academy, actually, with his unimaginable intelligence and logical thinking, he fits, but you still can’t help but feel you was somehow betrayed.