Non

Lieutenant Non is the husband of the late Astra and the second-in-command of their army, though after her death he seems to have taken over her role as Commander. He is a Kryptonian criminal, warlord, and one of Supergirl's chief antagonists.

Fort Rozz
Prior to Krypton's destruction, Non worked with Astra, and killed a guard in their actions, prompting Alura Zor-El to attempt to bring them in.

Earth
Upon being released from Fort Rozz, they continued to work together and while the D.E.O. and Kara Danvers are occupied with battling and capturing Astra, Non and his men attacked Lord Technologies, and he was about to kill Alex Danvers before Kara arrived to fight him.

Non, however proved to be the superior in terms of physical power and began strangling her. Hank Henshaw tried to intervene in the fight but was abducted by Non. Later Non killed a mind-reading alien who found Hank impervious to his abilities. Non agreed to change exchange Hank for Astra. But when the trade is made, Non sprung an ambush; however, Astra called off the attack, demanding that a reluctant Non honor the agreement, though it is not a truce.

Death of Astra
The Kryptonians prepared for the next phase of their mission - "Myriad". Non revealed he had incapacitated Kara with "Black Mercy", thus technically did not disobey Astra's order for her to be unharmed, but she was displeased regardless. Non and Astra briefed their soldiers, armed with anti-kryptonite suits, about their campaign they fought for on Krypton, now to be completed on Earth. After they left, Non questions Astra's whereabouts prior and her dedication to their war. Astra tensely affirmed it, and he apologized and left. The Kryptonian attacked the D.E.O. satellites. Kara tackled Non was he was attaching something to a satellite dish and furiously pummeled him screaming about how he took her world away from her and thought he could do the same to Earth (strangely, Non barely fights back) but Non still managed to activate his device. Kara and Non continued to fight and Non claimed Myriad will "cure" Earth of humanity. Non sabotaged the satellite dish and escaped while Kara caught it. Non eventually grew tired of the battle and blew Kara away with heat vision. Astra was killed in battle by Alex using a Kryptonite blade. Non and the Kryptonians took her body back to their base, and a soldier informed that the Myriad is operational and she did not die in vain.

Astra's funeral
Non came to Kara Danvers' apartment to ask Kara to come with him on behalf of Astra, which she agreed despite Alex's protests. Up in the sky, the funeral for Astra was held. Non told Kara he would hold a period for mourning, and vowed to kill her after it was over.

Indigo
Non met with Indigo but he wasn't in the mood to flirt with her as he still grieving over Astra's death. Indigo told Non that Astra's notion of living alongside the humans can’t work, and vows to change that so she and the Kryptonians can be only ones left on Earth. Finally, Non, using the Omegahedron, places it on a computer and a new version of Indigo begins to materialize, but in pieces, with Non saying that he wants her to do things his way.

Myriad
Non finally executed his plan on Earth, beginning with National City. He sent out a signal from the program Myriad that took over the minds of all residents, minus Kara Danvers, Maxwell Lord and Cat Grant. He intended to expand his domain to other cities, intending to enslave the entire population and make them all work as one. Superman flies to National City after hearing Supergirl's distress call, only to fall victim to the mind control. When Indigo captures Alex Danvers, he uses her to fight Supergirl as revenge for Astra. However, J'onn J'onzz brings Eliza Danvers in time to talk Alex out of it and simultaneously breaks her free from the enslavement.

A Dead World
Supergirl broadcasts a speech throughout the city that helps the residents break free, effectively ending Non's brief domain. With prompting from Indigo, Non decides to utilize the Myriad wave to destroy mankind, instead.

After discovering Non's plan, Supergirl and J'onn fly to Fort Rozz where they fight Non and Indigo. Non seems to gain the upper hand before Supergirl overpowers his heat vision, blinding him.

Personality
Non is extremely arrogant, stubborn, rude, vindictive, even for his family, although he did care about Astra and was saddened by her death and determined to carry on for her memory. He also cares about the welfare of the planet, as he wants to rule it and thinks the planet is being destroyed by humanity. He is extremely prideful; as he always tries to blame others for the problems he caused. He also firmly believes that enslaving the human race is the only solution to save the Earth, and because of this he does not have a good relationship with his niece Kara due to the fact that she is allied with the humans.

Non is also quite immoral as he had no qualms about enslaving the minds of the human race. He is also not afraid to go behind the back of his superior, although she was his wife, as Astra ordered that Kara was not to be hurt, but he used Black Mercy on Supergirl, to try to prevent her from interfering with his plans. He had no guilt or remorse for this, showing he was willing to do whatever was necessary to complete his goal, regardless of who he hurt.

Powers

 * Kryptonian physiology: Like all Kryptonians, Non possesses the power to absorb the light and radiation of stars, specifically those in the yellow or blue spectrum. his body is constantly absorbing and storing energy from Earth's yellow sun, which in turn grants them incredible powers, such as superhuman strength, senses, impenetrable skin, and even the power to defy gravity.
 * Longevity: Non's life span is considerably longer than a normal human and likewise ages much slower.
 * Solar energy absorption: Non is able to absorb and metabolize solar energy from a yellow or blue sun to obtain his powers.
 * Super strength: Non is much stronger than a normal human, as well as some aliens, when exposed to a yellow or blue sun.
 * Super speed: Non is able to at super-sonic speeds, both through flight and on foot.
 * Flight: As a Kryptonian, Non is able to fly by manipulating gravity.
 * Invulnerability: Non has nearly impenetrable flesh and bone, allowing him to take more damage than a normal human.
 * Accelerated healing factor: Non is able to heal and recover much faster than a normal human. His higher metabolism allows his body to process and burn calories much more faster than any other normal human, allowing him to not gain weight and remain physically healthy with little to no maintaining.
 * Super hearing: Non can hear perfectly across several miles and through structures.
 * Super breath: Non is able to exhale powerful gusts of wind from his mouth, as well as causing the temperature of his breath to drop below subzero cold, therefore allowing him to freeze nearly anything.
 * X-ray vision: Non is able to see through all solid objects, except for lead.
 * Heat vision: Non is able to shoot concentrated heat beams of variable intensity and temperature out of his eyes when exposed to a yellow or blue sun.
 * Immunity: Non is immune to all forms of diseases and illnesses on Earth.
 * Telepathic immunity: Non is immune to all forms of telepathy.

Abilities

 * Expert hand-to-hand combatant: As a former Kryptonian soldier, Non is an expert in unarmed combat.
 * Expert tactician: As a former Kryptonian soldier, Non is an expert tactician.
 * Multilingual: Non is capable of fluently speaking English and Kryptonese.

Weaknesses
Non possesses all the typical weaknesses of a super-powered Kryptonian.
 * Green Kryptonite: Like all Kryptonians, Non is weak against green kryptonite, as it is a radioactive mineral from his home planet Krypton. Green Kryptonite not only weakens his physical attributes, leaving him vulnerable to weapons and anything in general that can kill a normal human, but if he is exposed to it for too long, it will kill him.
 * Red Kryptonite: Like all Kryptonians, if Non is exposed to red kryptonite, he will become a corrupt version of himself, without morality, rationality, or any cares whatsoever. Left with only malice, pride and wrath, Non will become malevolent and prone to hostility and aggression, making him a danger to everyone around him.
 * Lead: Non can not see through lead, even with his X-ray vision.
 * Red sun energy: The energy from a red sun is known to be the Kryptonian's natural sun and therefore, exposure to it will make them the equivalent of a human on Earth.
 * Extreme energy: Extreme amounts of energy can be enough to damage or kill Non.
 * Heat vision: The intensity of heat vision is enough to burn and damage Non.
 * Solar energy depletion: Using his powers to its maximum for an extended period can significantly drain his solar energy to the point where Non loses all of his powers and is rendered more human like for at least a day. This renders him as weak as a human, allowing Non to get injured and killed as easy as killing a human.
 * Magic: Since Non's powers are because of his Kryptonian physiology, he has no protection from the supernatural world.

Supergirl
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Season 2
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Behind the scenes

 * In the DC comics and its adaptations, Non usually appears as the lobotomized disciple of General Zod.