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 * For the A.R. version or his Bujin counterpart, see and .

Adam Winters is Kamen Rider Decade, who is one of the supporting characters of the.

Personality
Adam is very ambitious, ruthless, charming, cheerful, kind, caring, brave, charismatic, selfless, hyperactive, enthusiastic, sarcastic and smart sense of humor, a laid-back demeanor, and has earned the respect of most people, making jokes about needy every situation, even in the face of certain death, to the annoyance of both friends and enemies. His reasons for this vary: either he wants to relieve the stress of a situation, or simply because he wants to hide how scared he really is during a crisis. It is generally agreed, however, that whenever a life is in danger, he will stop telling jokes, and become serious and demanding when the situation called for it. He regularly used his name as a threat, which only rarely worked, despite his apparent expectations.

Adam is told by many people that is brave such as friends, family, strangers and even his enemies. He also states that he has "brooding" look, that always branded him a rebel. It is mentioned that even though he is smart, he doesn't always see the obvious even when it is right in front of him, such as people's feelings and what they are trying to see indirectly. His selflessness and sense of duty causes him to try and shoulder the burden alone rather than involve others, whether he can carry that burden or not. This altruism intensifies the guilt he feels for his role in deaths that follow him. While generally calm and composed, he is prone to making poor judgement during emotional turmoil. He occasionally relapsed though. He tended to keep a massive smile on his face and simply enjoyed his journeys through multiverse.

Adam is willing go to extreme lengths to save those close to him, caring a great deed for his family and friends. He is also shown a merciful and compassionate nature, consistently extending an offer to help even his most dangerous enemies before putting a stop to their evil deeds. However, when his patience reached its limit or his enemies were duplicitous, they received no mercy or second chances. He would also try to avoid harming those who were not in control of their actions, as well as defend them from their captors or those who would cause them further harm. However, when defeating the enemy would cost him his own life, he was much more hesitant, unless it meant saving a friend. He is a strong willed individual, whatever obstacles that comes his way, if it's relationships, being misunderstood, or someone dying in his watch, he always gets back up. His indomitable will and don't give up attitude usually pushed him to do amazing feats.

Despite being considered a good person, he didn't think of himself as one, seeming more susceptible to changes in personality; he grew more vicious, unforgiving, and developed a short temper when he didn't have company to restrain his dark side. He also has a capacity for righteous anger, particularly when his friends are threatened or at risk, and when driven by his anger, he will not hesitate to strike down those who opposed him. He felt profound regret for the deaths he'd seen. His keen sense of loss led him to empathise with those who had also suffered, and feel driven to prevent death and destruction wherever possible, having a hard time accepting failure. Many people noted the reason he required a friend is to keep him from succumbing to his darker side.

Powers and Abilities
Adam has a wide range of skills, and has repeatedly shown himself to be at peak levels of physical and mental condition.
 * Genius-Level Intellect: Adam possesses a very sharp mind, aware of to his surroundings, able to determine much of the events that transpired from it. He is extremely intelligence, as he quickly showed a natural understanding and quick capacity to learn. He is able to analyze environments and predict every inch of it. He has an advanced knowledge of physics, and developed several of Decade's accessories on his own.
 * Enhanced Memory: Given his extraordinary level of knowledge and understanding of science, he most likely possesses an eidetic or photographic memory, which allows him to process and utilize his vast intelligence effectively.
 * Genius Physicist: Adam has an advanced knowledge of physics, having finished a difficult physics test with perfect results.
 * Genius Engineer: Adam has built the majority of Decade's accessories on his own.
 * Master Tactician/Master Detective: Adam is also a capable tactician, observation, forensic investigation, and inductive and deductive reasoning of the highest caliber.


 * Master Hand-To-Hand Combatant/Martial artist: Adam is considerably very skilled hand-to-hand combatant and martial artist. His style shows advanced skill in wing chun, systema, taekwondo, capoeira, kali, muay thai, boxing, hapkido, judo, ninjutsu, karate, krav maga, silat, wrestling and sambo.
 * Master Weaponry: Adam is proficient in handling any melee weapon or firearm such as Gun, Bo-Staff, Knife, Tomahawk, Kunai and also Sword.


 * Free Running/Acrobatics: Adam is an accomplished acrobat, capable of scaling buildings, and running from rooftop to rooftop with ease. He is maneuverable and graceful, able to pursue and outrun a target in various types of terrains. His skills allow him to fluidly dodge and attack from different directions without losing balance.
 * Master Gamer: Adam is a masterful gamer. He has extensive knowledge of games in many genres and can adapt easily when playing a new game. These skills are greatly enhanced when he enters a state of emotional rage or frustration.
 * Indomitable Will: A driven and determined person, Adam is nearly fearless and almost never gives up under most situations.
 * Stealth Expert: Adam is very elusive. He can sneak in and out of most guarded buildings without being detected, follow his targets for long periods of time unnoticed, and quickly disappear from sight even in broad daylight.
 * Polylingual: Adam can speak many languages, including French and Japanese.
 * Telepathy: Adam can read the thoughts and memories of others, and remotely communicate with them. He also has the ability to manipulate upper brain functions, enabling him to render others unconscious and can erase, alter or restore their memories.
 * Accelerated Healing: Adam heals faster than humans to the point of completely healing from a near-fatal wound within a day. His healing ability is so advanced that he can completely regrow lost limbs within a short amount of time.
 * Dream Walking: Adam can enter anyone's dreams to communicate with them.
 * Mediumship: Adam can see and communicate with souls and Gamma.
 * Pause Bypass: Adam can bypass the pause ability used by Cronus, similar to Hyper Muteki.
 * Mental Resistance: Adam is resistance to telepaths who can read and control his mind.
 * Resurrection: If people still remember him, he can be resurrected from the dead.
 * Interdimensional Travel: An otherworldly human himself, Adam can travel within worlds via.
 *  Abilities: Due to having no real home of his own, whenever Adam travels to another world, he takes on a role within it, granting him different abilities as well as all necessary needs to take on that role (IE clothes, documents etc.). Among these abilities are:
 * Culinary Knowledge: Adam is given the talent of a great chef.
 *  Travel: Adam can enter the Underworld without the need of an engage wizard ring.
 *  Interpretation: Adam showed the talent of understanding and speaking the Femushinmu language.
 * Medical Knowledge: Adam is given the talent of a great medical doctor.

Devices

 * - Decade's transformation device.
 * - Gives Decade the powers of past Kamen Riders, depending on which card used.
 * - Decade's personal smartphone that can transform into the Machine Decader or other Rider Machines.
 * - Decade's mini-support robots.
 * - Decade's device that allows him to transform into Complete Form.
 * - A stethoscope-like device.

Weapons

 * - Decade's primary weapon and essential for holding Rider Cards.
 * - Decade's firearm weapon.
 * - Weapons of past Kamen Riders accessed through Kamen Ride, Form Ride, and Attack Ride cards.
 * - Decade's personal weapon as Form Ride: Double HeatMetal.
 * - Decade's personal weapon as Form Ride: Double LunaTrigger.
 * - Decade's personal weapon as Kamen Ride: OOO.
 * - Decade's personal weapon as Form Ride: Fourze Elek.
 * - Decade's personal weapon as Form Ride: Fourze Fire.
 * - Decade's personal weapon as Kamen Ride: Wizard.
 * - Decade's personal weapon as Kamen Ride: Gaim.
 * - Decade's personal weapon as Form Ride: Gaim Pine.
 * - Decade's personal weapon as Form Ride: Gaim Ichigo.
 * and - Decade's personal weapon as Kamen Ride: Drive.
 * - Decade's personal weapon as Kamen Ride: Ghost.
 * - Decade's personal weapon as Kamen Ride: Ex-Aid.
 * - Decade's personal weapon as Form Ride: Ex-Aid Level 3.
 * , and  - Decade's personal weapon as Form Ride: Ex-Aid Level 5.
 * - Decade's personal weapon as Kamen Ride: Build.
 * - Decade's personal weapon as Form Ride: Build HawkGatling.
 * - Decade's personal weapon as Form Ride: Build NinninComic.
 * - Decade's personal weapon as Form Ride: Build KaizokuRezzya.

Vehicles

 * - Decade's Rider Machine.
 * - Alternative machine form accessed through Decade Phone.
 * - Alternative machine form accessed through Decade Phone.
 * - Alternative machine form accessed through Decade Phone.