Richard Rhyneheart

Richard Rhyneheart is a main character in Richard 10: The Alpha-Omegatrix.

Physical Appearance
Richard has short dark brown hair, dark brown eyes, pale skin, and he's quite skinny for his age (though his various future selves are portrayed as quite muscular), though he shows a lot of muscle definition due to being athletic. He wears a white, black jeans, a red jacket, and black shoes. Richard wears the Alpha-Omegatrix on his right wrist in a watch-like manner. Like all the other main characters, his physical appearance hasn't changed much.

When the cross over special with Generator Rex occurred, Richard's appearance changed according to the animation of that series, becoming sleeker and more mature.

In Alpha-Omegaverse, Richard wears a new shirt that resembles Ben 10's classic shirt when he was ten. His shirt is white and has a red stripe in the middle and red stripes on the sides of his shirt. He wears black pants and red and white shoes. He wears the Dominatrix on his right wrist.

Personality
Richard is initially portrayed as a cocky, arrogant and immature boy who tends to make jokes even when fighting. He easily gets full of himself and enjoys attention. This attitude can sometimes make him look obnoxious or dumb, often resulting in criticisms from Gwen and later Kevin. It also causes him several conflicts with Azmuth. These traits, however, stem from Ben's attempts to hide his own fear about the situation (though he denied it and said he was actually oblivious). He's capable of great leadership skills and tends to get serious when the situation requires it.

Powers
Richard is the wielder of the Alpha-Omegatrix (later the Dominatrix), which gave him the power to modify his own genetic code in order to turn into various alien creatures, literally making him an alien shape-shifter.

When transforming into an alien, Richard gets all the creature's features, including its appearance, voice, all of its unique and special abilities and powers, strengths and weaknesses. Though he mostly retains his personality, there are some cases where the transformation causes change in it, such as Rath becoming far more aggressive, SpiderMonkey acting more childish, or Big Chill being affected by his reproduction instincts. Two of the aliens, Ghost Freak and Big Chill, even managed to actually take over Richard's personality twice.

In addition to transforming into aliens, the Alpha-Omegatrix, the Dominatrix, and the Legendatrix include what is referred as an "evolutionary function," that allows Richard to evolve his aliens forms in order to get upgraded, much, much stronger and much more powerful version of themselves, referred as Ultimate Forms, Alpha Forms, Omega Forms, Dominant Forms, and Legendary Forms. It's explained that the function works by placing the selected alien form in a simulated planet wide war in a worst case scenario for a millennia or so then simply modifying the old DNA to match the new.

Trivia

 * He gains most of the aliens that Ben has, with exceptions, those aliens are replaced, with the exception of GhostFreak.
 * Brainstorm replaces Grey Matter.
 * K-9 replaces RichardWolf.
 * Un-Named replaces Alien X for the remander of the show after In Alien X We Trust?, not including when Darama used him in All Out War Part 2.
 * Sub-0 replaces ArcticGuana.
 * Triple Drill and Quaker Waker replace ArmoDrillo for the remainder of the show after The Evil Within.
 * GhostFreak is used once, but is lost due to Z'skayrs escaping, and was then, along with RichardWolf, replaced by K-9.
 * Swampfire, Ultimate Swampfire, Diamondhead, Bloxx, Gravattack, FeedBack, and Ball Weevil are locked aliens, but are then unlocked by Richard 10,000 in Richard 10,000.
 * In four of the crossovers, Meet Ben 10, Generator Rex & Richard 10: Heroes of Today, Richard 10/Mig 10: Heroes United, and Richard 10 & Sif 100: Brothers United, Richard does not shout out the name of his aliens.
 * Although he doesn't shout out the names, in Heroes United, he yelled out "Bloxx" the second time he used him.