Kuro

Kuro (クロ) is a Filolial King raised by the Spear Hero, however, reverted back into an egg yet to be hatched at the start of the second loop.

Filolial
His feathers are a shade of dark black.

Because he was raised by a hero, he was able to undergo the extra stage of development of developing into a Filolial King resembling giant owl.

Human
He has the ability to transform into a human resembling a young angel.

His hair is average in length, tied into piggy tails and black. He wears a dark dress made by Motoyasu. Despite his feminine looks and feminine clothing, he is confirmed to be male.

Personality
He's very cheerful and playful.

Background
He was bought from the Slave Trader in Melromarc and later raised by Motoyasu Kitamura.

Loop 1
Kuro was originally purchased and hatched by Motoyasu with the hope that the egg belonged to Filo, however, the possibility was dropped realizing his feathers were black rather than pink. Despite this, Motoyasu treasured and raised him with care.

Kuro rapidly developed into a Filolial King after hunting monsters and power-leveling alongside Motoyasu and later Naofumi. Two days after sending Naofumi to Siltvelt, he would later develop the ability to transform in a human.

Unfortunately, Naofumi was killed by the fake Siltvelt emissaries and thus time was reset. Kuro was reverted to an egg at the Slave Trader's tent.

Trivia

 * In the Main Series, he was raised by a regular farmer. He was named Black Thunder and his personality was very different.
 * Motoyasu originally thought of two names for him. The first Kuro and the second Black Thunder, he later decided to stick with Kuro because of Naofumi's opinion.