skeleton

1. Hostile and aggressive: Skeletons in Minecraft are known to attack players and other mobs without warning. This suggests that they have a hostile and aggressive nature.
2. Impulsive: Skeletons seem to act impulsively, attacking anything that moves in their field of vision. This could indicate that they don't have much ability to think before acting.
3. Simple and primitive: Skeletons do not seem to have great emotional or intellectual complexity. They limit themselves to attacking and defending themselves, without showing signs of intelligence or strategy.
4. Tough and Persistent: Despite being relatively weak compared to other mobs, skeletons can be quite tough and persistent in their quest to destroy their enemies.

Its body is completely covered with scales, but its scales are made of bone, its skin and scales are light gray.

It is NOT a skeleton, it is alive and it calls itself that only because of its skin color (gray) and its character.