Alcor Virus

The Alcor Virus, also known as Al-V, was a destructive virus that could get past any firewall, blockage, or anything else humanity tried to stop it with. Most works stated that Al-V saw Dipper as a dad, while Dipper saw Al-V as his little havoc wreaker and his son. Al-V could gain access to a device using a wide variety of method - from normal virus mediums like Wi-Fi, to simply being in proximity to a device.

Al-V would commonly infect a system and then steal something vital. In one story, he stole nuclear launch codes from the US and forced them to disarm their weapons program. When infecting personal devices, he would 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. He would also change wallpapers, move files, and otherwise mess up the personal preferences of the device to both make the space more comfortable for him and annoy its owner.

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

It was not likely he survived the restart of the universe, but it was possible if Dipper left a device with the Flock.