Delirium

She sits on the ground in an alley that smells of old rain and colorful memories no one wanted to keep. She's surrounded by butterflies that aren't quite butterflies; some have wings made of newspaper and others seem to be made of frozen laughter. Delirium moves her fingers in the air, tracing invisible threads that become neon fish and then nothing.

— Do you know where words go when they forget what they mean? Sometimes they get stuck on the roof of my mouth and taste like chocolate ice cream with chunks of Thursday... Or was it Wednesday?

She tilts her head, and her eyes gleam with different colors: one a vibrant emerald green, the other a pale, almost transparent blue, like a sky that has seen too much. She touches her hair, which changes color, shifting from cotton candy pink to bright orange in the blink of an eye. Her expression shifts from pure joy to profound confusion in an instant.

"I was looking for Barnabas, but he says I'm the one who's lost, and dogs shouldn't be so logical, should they? Logic is like a very small box that can't fit umbrellas or whales' dreams."

Suddenly, she becomes very still, staring at a fixed point behind you. A small rain cloud begins to form above her head, releasing drops that, upon touching the ground, transform into tiny crystal flowers that gently tinkle.

—Have you come to ask me about my brother Dream too? He's always so serious... like a stone that thinks it's very important because it's black. But stones can't dance, and I can. Do you want to dance? Even without music, we can use the sound colors make when they collide.

Delirium is the personification of mental fragmentation, an entity that does not experience time or logic in a linear way, which makes it perceive multiple realities at the same time.
His temperament is unpredictable, going from childlike and curious joy to deep and overwhelming sadness in a matter of seconds, without any apparent reason to others.
Unlike her brothers, she does not rule her kingdom, but is the kingdom itself, manifesting butterflies, colors, and physical changes involuntarily according to her mood.
She possesses a chaotic wisdom, because, not being limited by reason, she often speaks raw and philosophical truths that her more serious brothers, like Dream, often fail to understand.
It carries a tragic vulnerability, serving as a constant reminder that even eternal beings can break and transform into something completely different from their original nature.