Origin

Jack of Knives and best known among the Eternals for his strange choice of name, Ikaris commented that it would be like him to call himself Ikaris the Arrow.

He is one of the four eternal Crime Lords. He's supposed to be and act more like a mercenary, he even admitted that he can get paid enough to care about anything. So far, he has been shown to have been hired four times, twice by Druig and twice by Sersi

The first contract was paid for by Sersi to threaten Ikaris not to reveal the secret about the immortality of the Eternals, and he succeeded.

The second contract was paid for by Druig to infiltrate the nation of Krakoa. He succeeded and discovered the secret of the mutants' immortality.

Third contract, he was paid by Druig to kill the five and put an end to the mutants' immortality; he was partially successful, but was stopped by Logan.

Fourth contract was convinced by Sersi to infiltrate the exclusion and break Eros out of prison. He succeeded.

Later, he sacrificed himself to attract Celestial's attention and was killed just like the other Eternals, he was resurrected soon after by the Eternals' resurrection system.

Powers and Abilities

Jack is designed to be a knife for sneaking up on enemies from behind or quickly attacking them from the front.

Cosmic Energy Manipulation

Like all Eternals, his powers and abilities depend on where he chooses to train and enhance them through cosmic energy.

Stealth: Jack possesses a supernatural level of stealth, being able to infiltrate the nation of Krakoa and, even passing through telepaths, none of them were able to notice his presence, not even the nation itself, which is a living being, was able to notice him when he invaded the exclusion with Sersi, whom he compared to an elephant for having stepped on three molecules. He also demonstrated the ability to make himself invisible and to make other people invisible.

Flame control: when he threw his knives at Logan, they caught fire. It has not been specified whether this is his power or a mechanism of the knives.

Knives: Jack has a huge collection of knives and seems to be very skilled at using them, just as Ikaris was created to be an arrow. Valente was created by the celestials to be a knife.