THIS is what I imagine a fully customized and kitted out (kind of a pun) omni-frame build looks like.
Lynx
Armaments:
Frame: Medium (Mobility/Offense 50/50) - Heavy Reactor
Primary (ranged slot): Twin Energy-SMGs (Incendiary and Cryo) a.k.a. Plasma Casters
Secondary (ranged slot): None
Tertiary (melee slot): Dual-Shredders (Electrified)
Support (offensive): Needle-Ball (Electrified)
By sacrificing the use of a secondary ranged-weapon, as well as larger melee-weapons and using the spared energy, the lightest of the medium-builds can equip themselves with, not a single, but a pair of energy-claws for extremely close-range melee combat, accepting the dangers that can come with it. With the removal of some of its armor-plating, it's the fastest and lightest of medium-builds. It can keep pace with below average Sly-Dancers frames. It needs the extra energy-reserves of its heavy core to power its weapons, particularly its claws and thrusters and servos to remain highly mobile.
Shredder claws can normally cause organic targets to bleed, while sustained and sufficient strikes to the same target and specific locations on it can weaken armor, reducing its damage reduction. The gauntlets vent heat from exhaust ports on the hand-plating.
Upgrading:
Elemental Scars - Through the installation of plasma-injectors, dynamos, cryogenic-inducers or chem-catalyzers, single and dual-shredders can possess incendiary, shock, freezing or corrosive effects.
Cut to the Bone - Proper energy-allocation and research into energy-containment can improve penetration, allowing for deeper wounds to be inflicted, also increasing effectiveness against armored targets. The energy-based equivalent of how kinetic melee-weapons are upgraded through better alloys.
Needle Ball (Offensive Support): The back-mounted launcher points a short to mid-range laser (where the crosshair is) and releases a handball-sized gyro that homes in on it. The ball bounces along the surface, continually discharging highly-compressed pellets, in every direction, as it is being guided. Once it runs out of the contained payload, it explodes for very minimal damage. Depending on guidance, the gadget can deliver moderate to high-damage, saturating even multiple, clustered targets. May cause bleeding in smaller organic targets, shredding them.
(Inspired by the Bouncing Betty grenades in Borderlands 2)
Abilities:
Rocket Kick: An assisted knee-kick, using the custom-built thrusters on the outer lower-thighs, for added force. Exclusive to medium-builds. Primarily used as a defensive-strike against single targets, potentially stunning them to stop their attack. Can also be used mid-air, in emergencies, to slow a fall and reduce damage to the frame, or to briefly keep the frame aloft, for a second longer, potentially avoiding attacks.
Wing-Sprout: Nearly all power is temporarily transferred to every thruster for a burst that propels the frame over the terrain, close to the ground. Consumes considerably more energy than the quick dashes of lighter frames, but covers more distance. Also, as with lighter frames, this rapid forward movement can be an evasive maneuver or an offensive charge, when coupled with certain melee-attacks. Particularly effective when used with the Rocket Kick to deliver heavy blunt-damage against smaller targets and even knock larger ones off their feet. The frame is able to turn in a 90 degree angle mid-air.
Pounce: Leaping, downward melee-slash, using both hands. Only possible with Dual-Shredders. More than doubles the damage a single shredder attack would do and also applies a stronger bleeding effect against unprotected organic targets. Can rend armor plating, weakening the target's protection and incurring penalties to its damage resistance, either on the whole body or parts of it, in the case of larger foes.
I know that's 3 abilities, but I don't care. Tried making the techno-babble makes sense.