Don is a brown mole with a dark-brown beard, black whiskers around his nose, and black, upturned eyebrows with dark-brown linings. His hands and the tip of his nose are brown to dark-brown. Like his younger brother, Mr. Resetti, he wears a white shirt, blue overalls, black boots, and a yellow helmet. He is taller and thinner than his brother. In Doubutsu no Mori+ and Animal Crossing: Happy Home Designer (for his house), he instead wears a brown haramaki and green helmet with a white stripe. He mostly closes his baggy eyes and mouth, only showing black eyelids and dark-brown lips, but when he opens them, his eyes are small, oval/round-shaped, and black with white pupils, while his mouth has reddish-pink inside, and inside also has white buck teeth and a pink tongue.
Don is not as harsh as his younger brother and will merely advise the player about saving rather than yelling, threatening them, or having the player repeat sentences after him.
Don explaining to the player how his brother can be harsh in Animal Crossing.
In Animal Crossing, Don Resetti replaces his brother the fifth time the player resets. He appears mellow in comparison to his brother, by not shouting and screaming at the player for resetting. He does not appear again afterwards.
Don Resetti reappears in Animal Crossing: City Folk after his absence in Animal Crossing: Wild World, and his personality has not changed since Animal Crossing. He appears after the player resets five times. He is mild mannered, and tells the player that his brother (who he refers to as "Sonny") is a good guy. Unlike Resetti, he does not yell "SCRAM!" when he ends his talk.
Don will also sometimes be present in the Reset Surveillance Center. This can be accessed after 8:00 PM on random nights and if one of the two traffic cones are removed. Once the player enters and talk to Don or his brother, they will give the player a silver shovel to leave.
Don Resetti also appears in Animal Crossing: New Leaf. He replaces Mr. Resetti the sixth time the game is reset after the Reset Center has been built and does not appear again. If the player visits the Reset Center five times, Don will give his picture to the player.
Like his brother, Don also works with the Rescue Service and only appears via dialogue. He sometimes fills in for Mr. Resetti, and he may also appear in Resetti's place if the player calls the Rescue Service excessively, mentioning Resetti is taking a break. He will tell the player to think of him as a role similar to a substitute teacher, keeping his calm demeanor and admitting that he is new to the program. He will fill in for the player when he is first called, meaning that he can be called again multiple times in a single day until the next day. He will no longer answer to the player afterwards.
With the release of the 2.0 Free Update, either he or Mr. Resetti will usually show up at The Roost at a set period of time, such as around 2:00 PM to 3:00 PM and can be talked to. If his amiibo is scanned, he will bring Mr. Resetti along with him.
NTSC-U: Don and Sonny Resetti run the Reset Surveillance Center. They keep a careful eye out for players who might be resetting their games without saving. As Don likes to say, "Resettin' ain't good. So don't do it!" If Sonny is the brother who catches you, you'll hear a lot more than that!
PAL: This chap runs the Reset Surveillance Center with his brother, the fabled scolder Mr. Resetti (first name: Sonny). Their job is to warn players who switch off without saving. Don's gentle about it, though. He'll say stuff like, "Resettin' ain't no good. So, um, don't do it!" If you get caught resetting, just hope it's Don's face you see.
If you feel bad having to listen to Mr. Resetti every now and then, think about how his brother, Don, feels! But Don's a nice guy, and he worries about his brother's health. You don't want to do anything to get Mr. Resetti too worked up, or Don might just have to have a word with you.
If met at The Roost in Animal Crossing: City Folk, Don Resetti's dialogue will imply that the player has reset before. This is true even if the player has not reset at all on that save file.