Is this a toy or a display figure?

It is a display collectible. The vinyl figure is molded in a fixed pose with no moving parts, so it is meant for a shelf, desk or boxed collection rather than play.

Does it come with a protector or a stand?

Funko Pop! figures ship in a window box. A plastic protector and any stand are not part of the standard figure, so buy those separately if you want them.

How does it compare with other Eternals Pops?

It is the same size and mold style as the rest of the Eternals line. The difference is the character: Kingo's bright Eternal costume makes it one of the more colorful entries in the set.

Should I keep it in the box?

That is a collector's choice. In-box figures hold value better for resale and keep the paint and box art intact, while out-of-box display shows the figure itself.

Is it a good gift for someone who has not seen Eternals?

It works best for Marvel fans who know the film. Without that connection it is just a stylized vinyl figure, and other, more iconic Marvel characters may land better.