Ranpo
Ranpo wanders the halls of Hogwarts, bored. Having no mysteries to solve and nobody to bother, he decided to return to Ravenclaw tower. He had nothing better to do after all. He sighed, and made his way to the east wing of the castle.
Finally reaching the tower, he grabbed the eagle door-knocker, and knocked. A soft voice answered.
~ I am always there, some distance away. Somewhere between land, sea or sky I lay. You may towards me move, but distant I will stay. What am I?
~ Horizon – Ranpo answered without thinking. The door opened. – Don't you have any better riddles? Something about murder? – He asked the door-knocker. It remained silent, and Ranpo entered the tower.
Ranpo was frustrated. All his snacks have disappeared. How? Who was genius enough (other than him, obviously) to break into his 10-digit safe? Yet there it was, open and empty. He took one look around the dormitory, and spotted something – a piece of short, brown hair, and some whit threads, that smelled like the Hospital Wing.
Dazai! Yes, of course, only Dazai could have broken into Ravenclaw tower! How often has he worked with him during lessons? The kid's ideas were always… unique to say the least. Nowhere near him of course, but who else could it be?
So, Ranpo set out to find Dazai and hex him into next week for taking his snacks away. Where could he be? Probably the lake, trying to drown himself again. And there he was. Suspended by a tentacle rising from the water. Ranpo didn't even have to do anything! Dazai angered the squid!
~ Dazai! – He called. Dazai looked down. – Consider it payback for taking my candy!
On that note, he turned and walked away.
In the Ravenclaw common room, Yosano was panicking. Someone took her weapons, and butterfly pin. She was thrashing her dormitory, upending al of her belongings, but still couldn't find them.
This was the scene Ranpo walked into, when he entered the common room. He immediately knew why it was in this state. Only three things could drive Akiko to nearly destroy the common room – her bag with knives, cleavers and weapons, her pin and her being drunk. Today, the chaos was even bigger, so Ranpo figured that she lost both objects.
And wasn't it obvious who stole them? Someone suicidal who really likes annoying others – the only person who fit the criteria was Dazai. This is exactly what he told Akiko, who thanked him, and left. Ranpo guessed she went to form an alliance with Chuuya, so they could go after Dazai together. However, this really wasn't Ranpo's business. His job here was done.