Aaron/Synopsis

History
Aaron was the one of the test subjects from a research initiative called "Project Apple," conducted by the previous Ostanian regime for the purpose of producing highly-intelligent animals from a variety of species for military purposes. After the research got terminated by the new administration, the former test subjects, including Aaron, ended up in the black market. Eventually, they fell into the hands of the terrorist group led by Keith Kepler and crudely trained as bomb dogs.

Doggy Crisis Arc
Aaron, another German Shepherd and a supposed Doberman Pinscher were first shown in cages when Keith and his assistant loaded them into a van. WISE learns of the assassination plot against the recently arrived Minister Brantz, and Sylvia Sherwood orders an emergency summons to HQ, bringing Loid Forger into the mix. After the agents capture Kris, one of the members of the terrorist group behind the plot, a disguised Loid tricks him into revealing information about the group and their plan, and Kris explains their use of bomb dogs.

In Loid's absence, Anya Forger sees two terrorists on the street along with Aaron and Bond. Anya's telepathy picks up Bond's precognitive abilities, and after escaping from Yor Forger, she does follow them into the den of terrorists. There she notices Aaron, Bond tied to pipes, as well as an unnamed bullmastiff and Dobermann. Anya also overhears a conversation between Keith and his group about an upcoming assassination attempt, but she is caught by Kurt, after which Keith decides to get rid of her.

After Anya's rescue by Bond and their joint escape, they were chased by Keith, Kurt and Aaron (Bond's current replacement for the upcoming explosion). Anya and Bond were eventually overtaken by them, but were rescued during the arrival Yor, who knocked Kurt out and put Aaron and Keith on the run.

WISE successfully intercepts a van with four terrorists inside, and they detain them with three dogs in tow. They also found a case of explosives but could not find Keith Kepler. At the same time, Keith attaches a bomb to Aaron and tells the dog to go after Minister Brantz. Keith believes now that his Plan B positions are compromised, the clock tower will be swarming with security. However, he decides to use this to his advantage so he can attack them. Sylvia sends out WISE agents to each of the four potential locations they have for Keith, with Loid going to position B1, which is at the clock tower.

While WISE agents are tinkering with bombs, Anya and Bond were rushing through the streets in an attempt to prevent Loid's predicted death, but Aaron, who noticed them, almost gives them to Keith. Nevertheless, the irritated Keith does not notice them and takes Aaron away to the supposed location of the minister. When taking care of all four bombs, Loid goes to Minister Brantz to take his clothes as a disguise. Brantz calls Sylvia in a rage and complains about getting 'mugged.' Sylvia explains that they needed his clothes so Aaron would pick up his scent, and she asks him to put some clothes on before he leaves.

Aaron took the WISE's bait and led Keith behind not the minister but the disguised Loid. During the chase, they were almost neutralized by the unnamed WISE agent, but Keith managed to break away almost killing the agent with a grenade. The angry Aaron began to chase Loid, who had abandoned the car. Loid tried to shoot him, but Aaron dodged all his bullets with super speed. Having lured them both into a deserted alley, Loid tore off his disguise. Aaron was discouraged that he had been chasing a non-minister all this time, but decided not to back down and continued to attack Loid decisively.

When Aaron got close enough to Loid and attacked him, he suddenly fired not at the dog, but at the straps that held the bomb on his back. The shot did not frighten Aaron and without jumping back, he clung to his arm. Keith, seeing this, thought that the dag had overtaken the minister and activated a detonator to blow them both up. However, his plan failed because Loid managed to throw a bomb into the river. He, wanting to chase Keith, neutralized Aaron by locking him in a dumpster, but Keith managed to escape. However, he does not manage to get far, because Yor catches up with him and knocks him out, smashing his car along the way.

After stopping Keith's plan, the agents reconvene at Kemono Park, the pet shop run by WISE. Inside, Loid, Sylvia, and the other two WISE agents discuss all that went down that day, and Sylvia states that they will let the Ostanian government handle the clean-up of this mess. One agent asks if that includes giving them the dogs, but Handler says they will keep them until they get further orders. Afterward, Loid takes his leave, telling them that he needs to get back to his family. Outside the shop, Loid runs into his family, along with Bond. Loid looks in Sylvia's direction, both of them knowing they cannot let him run free.

Sylvia and another agent approach the Forgers disguised as SSS agents for questioning. Anya manages to convince Sylvia and Loid to leave Bond who saved her to her family and asks that the other dogs captured by the bad guys be well taken care of. Sylvia agrees and then temporarily takes him with Aaron and the other dogs to return Bond to Anya later.

Red Circus Arc
It was revealed that Aaron was adopted by Sylvia and now the two of them live in her apartment. One morning, Sylvia quickly goes back to sleep after shutting off her alarm, only to have her dog wake her back up. Sylvia goes to work and goes to the Westalis embassy, but upon arrival from there she declines a lunch invitation to walk Aaron.

Returning home, Sylvia calls for Aaron for their walk (which, in truth, is her meeting with Loid). The dog excitedly runs over to her but slips on a piece of paper and hits his head on a cabinet. Sylvia apologizes for the mess and begins cleaning up but stops after reminiscing her past with her late daughter and unknown partner. Meeting at the dog park, a disguised Sylvia sees Anya playing with Bond, and Loid explains that Anya wanted to play after her half-day at school. As Loid greets Aaron, he obtains a note from the dog's collar and receives an extra mission for the following week. Aaron recognizes Loid, but the dog no longer shows aggression, caresses him and wags his tail.

During a conversation about raising their main mission, Anya recognizes Sylvia and, together with Bond, runs to her and Aaron. Loid recognizes Aaron as one of the bomb dogs used in Minister Brantz's assassination attempt, which Sylvia confirms, adding that she took him into her care. Aaron also recognizes Bond, but resents him for not recognizing him and almost starting a fight with him. Sylvia stops their quarrel and decides to leave. However, Anya and Bond run after her, asking for Aaron's name and why she picked it. Sylvia blithely declares that she just chose the first name that came across, which shocks Aaron and causes embarrassment to Loid and Anya. Recovering quickly, Anya declares that the two dogs should have a showdown to see who is better. To Loid's surprise, Sylvia accepts and convinces him to participate by promising to remove his new extra mission if he wins.

The first event is the obstacle course, and whoever finishes it to the end faster wins. Determined to ensure that her leadership skills are superior to Loid's, Sylvia and Aaron earn a flawless 39 seconds. On the contrary, Bond stumbles across the course and finishes at over 2 minutes. However, Loid refuses to back down. The next event is "tracking and retrieving," in which the dogs must find their opposing owner's handkerchiefs, which have been hidden around the park. The dogs begin by familiarizing themselves with Loid and Sylvia's scents, who have wiped away their scent as much as possible. The dogs start tracking, and Bond quickly retrieves the handkerchief from Sylvia's jacket, although he was actually tracking the dried pasta stuck on it.

The final event is frisbee tracking and the dog who can catch a frisbee thrown the farthest wins. Loid and Sylvia throw their frisbees, and while Aaron runs after his frisbee, Bond stays in place, to Loid's confusion. As the sudden gust of wind comes, the frisbees fly back to Bond, who runs over to catch his. However, the frisbee hits him in the face, and he falls over, and Sylvia decides to call it a tie.

Afterward, Sylvia and Loid watch Anya play with Aaron and Bond on the side, where she informs Loid that there are rumors that some of the Project Apple research teams may still be operating and that WISE intends to find out if they are connected to Donovan Desmond. Sylvia prepares to leave with Aaron, and Anya accidentally strikes a nerve when she says that someone at her age had fun. Despite that, Sylvia confirms that she did have fun and tells Anya they should play again sometime. On their way home, Sylvia promises Aaron that she will tidy up their home when she returns from work.