Melek Taus is technically a high-class angel (in lack of better term), that looks like a combination of a peacock, a phoenix, and geometry, combined with an attitude of a spirit of a 2-year old kid possessing an angry goose. It is only the size of a large peacock. Rougly said it is literally a weird bird with too much power and short nerves. It can burn things into ashes before they even realize they're on fire. It can also create life but its creations are merely animals which are indestructible. Luckily it is not smart enough to cause actual disasters and rarely is in any contact with regular world residents.
And it has just one expression.

¤ Traditional art; ink, brush pen, watercolor, gouache, golden paint, 2023. There's no way that scanning could preserve how actually cool the gold is in real life but here have photos.