Alcor Virus

The Alcor Virus, also known as Al-V is a destructive virus that can get past any firewall, blockage, or anything else humanity tries to stop it with. Most fics state that Al-V sees Dipper as a dad, while Dipper sees Al-V as his little havoc wreaker and his son. Al-V can gain access to a device from anything from normal virus mediums like Wi-Fi to simple proximity to an infected device.

Al-V will commonly infect a system, (especially the many governments of Earth) then steal something vital, such as one fic where he steals nuclear launch codes, and gives a list of demands while said government scrambles to met them. As far as infecting personal devices he will often send weird or inappropriate files (usually Twin Souls) to bosses, coworkers, and family members in an attempt to screw them over and embarrass them.

It usually works.

He also will change wallpapers, move files, and otherwise mess up personal preferences of the device to both make the space more comfortable for him and annoy the owner of said device

Al-V presumably lasts right up until the end and restart of the universe, because as long as devices and tech exist, so does he.

It's unknown is he ever pops up after the restart of the universe but it is possible if Dipper left a device with the Flock.