Genos

Genos or the Demon Cyborg, is the deuteragonist of the webcomic-turned anime/manga series One Punch Man. He's an S-Class Superhero of the Hero Association and is the disciple of Saitama as he seeks to become stronger to kill a rogue cyborg that killed his entire family four years ago. He acts as a contrast to Saitama in the series.

Appearance
Genos has the appearance of a young 19 year old man with a face and hair similiar to that of a human. His entire body is covered in cybornetic enhancements stemming from the damage he took four years prior to the series and his skin is completely artificial. His whole body is made up of silver metal plattings and has an entire robotic body. His cloths are normal street cloths of a sleeveless white top and black pants as well. His arms are cybornetic and have changed over the course of the series.

Personality
In contrast to Saitama, Genos is a very serious character and is obsessed with becoming stronger and seeks to avenge his family after they were killed by a unknown rogue cyborg. He's obsessed with becoming stronger and has constantly pressured Saitama into caving in and training him which he manages to succeed. Genos is very dedicated to Saitama and often calls him "Master" and "Sensei" even before he was taken in as his disciple.

Abilities & Powers
As a S-Class hero, Genos is undoubtedly a powerful fighter. For someone his age, Genos also has significant battle experience, as he claims to have defeated countless evil entities and organizations before meeting Saitama. His youth and impulsiveness still overcome him on occasion and he remains much weaker than Saitama.

Immense Strength: Enhanced by his cyborg physiology, Genos possesses incredible physical strength, and is capable of breaking apart the ground with a drop kick, and punching rapidly with enough force to tear apart a cliff face. During his brief fight with the Sea King, he was able to land a full-force punch on the creature that sent it flying through the roof of the safety shelter.

Immense Speed & Reflexes: He can move so fast that he appears to be teleporting. He was able to keep up with Sonic, one of the fastest characters in the entire series, for a considerable amount of time during battle.

Immense Endurance: He can continue fighting perfectly well even with only a single arm. However, given the expression on his face after making contact with the Sea King's acid spit, it could be assumed that he feels pain from the direct acidic corrosion of his body. Although, besides this, he virtually never displays any sign of pain or fatigue.

Cyborg Modification

Full-body Cyborg Enhancement: Genos' entire body has been replaced with combat-ready cybernetics and prostheses, giving him an extreme level of strength and speed, as well as advanced sensors and projectile attacks.


 * Core: Genos' cyborg parts are powered by an orb in his chest labeled "core," presumably designed by Dr. Kuseno. Genos has shown to be able to put his core into the shoulder of his arm, throwing all of his energy into his heat beams.


 * Armor and Replacement Parts: Genos gains not only incredible durability from his armored body, but also benefits from the nature of robotic equipment itself. Genos can lose limbs or have his body torn asunder, only to return to perfect 'health' through replacement parts and repairs (the source of the replacement parts is unclear). As an android, Genos does not seem to feel pain, and can keep fighting even when missing limbs or injured severely. Genos' durability is such that despite taking several powerful blows from Carnage Kabuto, and having one of his own powerful blasts reflected at him, he was still conscious and able to stand and walk.


 * Incineration Cannons: Genos' palms contain ports which allow him to fire large and powerful blasts of heat or flame significant distances. A blast from his palms was powerful enough to obliterate a multistory building which was the base of House of Evolution. Later, while sparring with Saitama, Genos reveals cannons built into his fists and arms which can produce even stronger blasts. Genos has also been shown to be able to reduce the power of his blasts to a warm breeze, which he uses to dry dishes.


 * Sensors: Genos' android body contains a number of passive and active sensors which allow him to scan the environment for enemies, both during active combat and while scouting from a distance. The sensors are not perfect however, as they can still be fooled by the extreme speed of an opponent like Saitama, and their usefulness is limited by Genos' reaction time.


 * Boosters : Once Genos' engaged, these boosters located in his shoulders enable amazing acceleration. Using his palms for jet propulsion in the opposite direction, Genos is able to perform rapid maneuvers.


 * Anti-Saitama Tactical Arms: These are a set of replacement arms Genos used during the National Superhero Registry Arc when Genos and Saitama sparred in the quarry. These arms are differentiated from his normal arms by being black, having much larger shoulders, forearms and fists and generating a glow between the plates of metal and having his eyes go white when active. The fists and forearms of these arms open to reveal several guns. The beams generated by the guns are significantly larger that his normal blasts and are characterized by smaller individual beams circling the main beam. If he puts both of his fists together the resulting blast is massive, much larger than that of one arm.

Arms Mode: A prototype weapon system that Genos possesses. When inactive it takes the form of a suitcase. To activate it, Genos pushes a button on the handle and then throws it in front of him. The suitcase splits down the middle and separates, each half then opening revealing the "arms" inside with the container then flipping back to become the attaching mechanism. Genos then throws his arms into the new "arms" and they attach to him causing quite a bit of electrical discharge. When the "arms" fully attach, parts run up his shoulders and neck and his face is framed by pieces of metal. The new arms are much thicker and are all black, with the blaster on his palm having changed shape as well. While using these arms, Genos was shown to be able to move his core to the shoulder of his right arm, directing all of his power into a massive blast.  


 * G4 Upgrade: After defeating a battle robot G4 Genos replaces his parts with the parts of G4 which enhanced his speed and power.[34] This enables him to keep up with Sonic one of the fastest characters in the series and even cut off his hair. After this upgrade the design of Genos' arms changes again.

Fighting Style

Cybernetic Combatant: Genos uses the various inbuilt weapons and mechanisms of his cyborg body to either deliver powerful attacks or to distract his opponents. He is also an extremely skilled fighter in close quarters, able to fight against powerful opponents like the Sea King for a considerable amount of time with just one arm.