The Hyperion class of enemies are split into two big groups, humanoid ones and mechanical ones. You will find the humanoid enemies detailed on this page.
Combat Engineers are probably the most common of the human Hyperion enemies encountered in the game. They tend to stay at a mid-to-long range and try to shoot you with their SMGs. If you get close enough, they will likely retreat to a safe distance and continue their attack.
Very different to the Combat Engineer, the regular Engineer will be using an exoskeleton in battle. Due to this, they are considered armored enemies, meaning that corrosive weapons are ideal against them. The arms of the exoskeleton are powerful when they hit, but they can also use them to tear up pieces of the ground to throw at you. They also use lasers and small explosive charges to pack on the damage. Similar to the larger Bullymongs, they can also perform a leap attack.
Hawks are basically regular Hyperion enemies that use a rocket launcher as a weapon. While they are relatively easy to kill, the damage they can do is very high, so you should be extremely observant and take them out quickly if they do show up. To add to their damage potential, they can sometimes hover in the air thanks to riding on Surveyors.
Infiltrators are equipped with shotguns, meaning they will try to get in as close as possible to you before firing. This can happen a lot because they are also equipped with a camouflage system that is only operational whenever they have shield capacity left. It is ideal to use shock weapons against them, so that their shields will be depleted very quickly.
As their name suggests, these soldiers are outfitted with a sniper rifle and will likely hit you from far away, making you wonder how you took damage. You can either counter this with a sniper of your own, or try to quickly find them before they can build up the damage on you.
You will encounter many of these armored foes later in the game, as they are more prevalent than most other Hyperion humanoid units. Besides the assault rifles they carry in their hands, they can also deploy turrets, similar to Axton's action skill. Since they are armored, it's wise to carry around a corrosive weapon with you.