Maddelyn Diggs

Madd 9 was introduced as the Human Infiltration Attack Bot''', and one of Zenjox's greatest creations. She later became known as Madd 18. The virus claimed to have made her to look and feel like a human, while being a warrior bent on destruction. In truth, she is a human that was modified with cybernetic enhancements, and Axel's long-lost sister.

Past
When she and her brother were both young, an elderly relative of theirs gave them a pocket watch, and each received one key that would make it play music; a single key would play a melancholy tune, but fitting both keys together would make it play "The Farmer in the Dell"; both of these tunes engraved themselves in Maddie's memory. When they were both older, Maddie was abducted by Zenjox; Maddie spent some time in a factory where the virus forced humans to labor building Attack-Bots, which would later be used to make a doomsday machine in an attempt to destroy Autopia. Later, she ended up at Zenjox's palace, where she were subjected to its attempts to give them cybernetic enhancements; Maddie was given the identification number D78. With Axel's help, they almost managed to escape, but were recaptured and brought before Zenjox. Maddie was thrown into the pit where Zenjox built its robots, despite Axel's attempt to save her. Much of Maddie's moemories were erased through the modification; as a result, she doesn't remember her real name.

Zenjox's Servant
Successfully modified into having no memory of her former life, aside from the tune of "The Farmer in the Dell" which she often whistled, a year after Autopia's shields were raised, Zenjox planned to have her infiltrate the Riders, via BioLab's Rider auditions, naming herself Maddelyn Diggs, not knowing that that was her real name. She succeeded on deceiving the rangers, and would have gotten the Moto Driver, but the Autopia Security Forces found her out. She easily took out the guards, but in the process Axel discovered her treachery as well and took off with the driver and the Mach Cycle after Madd 9 had stolen Axel's bike. After a long and frenzied game of cat and mouse, Madd 9 almost got her hands on the driver, but Axel at the last minute bonded with the driver himself to prevent her from doing so.

After failing to obtain the Moto Driver, Zenjox was about to destroy Madd 9, however she managed to prove herself a still useful asset. She had the ability to "heal" injured Attack-Bots and, like Brainioid can implement cybernetic enhancements in a person to brainwash them into doing their bidding.

As one of Zenjox's most powerful Attack Bots, she has no fear. In battle, she wears a visor. Unlike most of Zenjox's other minions, Madd has been noted for enjoying her work in what can be considered a sadistic manner. If she has an opportunity to do so, she likes to stalk her "prey" and whistles has the tune of "The Farmer in the Dell" just before she strikes.

Madd has a personality similar to Axel's (before getting to know the Drive team a little better), often criticizing Zenjox's plans and talking to it sarcastically, much like Axel's former defiance of Dash. Adding to her rebellious personality, she didn't hesitate to leap at the chance to take leadership over the Zenjox Computer Network when it appeared Zenjox had been destroyed, and looked mildly disappointed when it returned to the base unscathed. She also appears to have a particular interest in Axel and they often clash with each other in battle while Auto Rider is fighting off other enemies or threats.

It has been pointed out that she has a survival instinct and she has the physiological need to sleep, suggesting a more human side to her. Despite her admittance of these particular traits, she has a condescending attitude towards real humans and has shown to be incredibly defensive and reacts violently should anyone call her one.

Revelation and Reformation
While she believed herself to be purely a machine that looked human, after Axel unlocks the secret of the pocket watch and recognizes the tune, he leaves the city to meet Madd. She comes, as he expected, and Axel stirs her memory by playing the tune with a single key, and identifies her as his sister. She is violently skeptical, attacking him when provoked, but she is stunned when, after being damaged, her arm bleeds. Scared and confused, she returns to the palace and scans the wound, the computer revealing that Axel had been telling the truth in all aspects. When Dean Roberts approaches her and says that she would inevitably fail now that she knew the truth, she resolved to destroy her brother and the memories in the name of Zenjox.

Axel's emotions prove to win her over, however, despite her best efforts, and she decides to start helping Team Drive. Identifying a plan that Brainioid comes up with, she helps Axel to infiltrate Zenjox's palace, download the codes of Brainioid's robot, and deliver the codes to the team, allowing Dash to gain Extreme Form.

Recapture and Reprogramming
However, Brainioid recaptures her after the battle and reprograms her to Madd 18, with no personality at all except for her loyalty to Zenjox. Her outfit turns black full black, her visor is no longer deployed during battle, and the blaster on her arm got bigger. Her voice also became more robotic, and some of her circuitry is visible on the right side of her head.

She planted the device that would activate the sleeping cyborgs outside an abandoned Autopia, giving Zenjox total control. Dean Roberts gave her the order to destroy Brainioid for his disobedience once Autopia was his.

Final Liberation
''to be added

Aftermath
to be added