Improved version of the T-400 with enhanced armor and weapons.
Featured in Terminator: Dawn of Fate.
The only Terminator that hunts in the water with a snake like design.
First featured in Terminator Salvation and is a boss in Terminator Salvation arcade game.
Vertical TakeOff and Landing (VTOL) capable flying robot mounted with guns. There are multiple variants with light and heavy models.
First appeared in Terminator.
MIR is the Soviet version of SKYNET introduced during the Terminator Hunters and Killers storyline that achieved sentience with the help of SKYNET.
Details on MIR can be found at Terminator Wiki
The comic is unclear how this variant actually exists. Normally I would assume its a mechanical endoskeleton with a Alien body but it appears to be some weird amalgamation of the two. Regardless they possess super strength making them a serious problem for both the humans and the Predators that are trying to stop them.
Several robotic K9 Terminator models exist. Most notably one was sent back to stop Robocop (which looks more like a spider endo-skeleton with dog flesh covering) and Skynet dispatched another variant called the Dire Wolf in an attempt to destroy the T-Infinity that Skynet had lost control over.
Featured in Robocop vs. Terminator and Terminator: Revolution.