Class mods (COMs) are character-specific: a Maya mod does nothing in Salvador's hands. Each one boosts a handful of that character's skill points beyond the tree's normal cap, and the Legendary ones usually carry a unique bonus on top — the Legendary Siren's movement-speed boost, the Legendary Gunzerker's cooldown for near-permanent Gunzerk, and so on.
Legendary Soldier
Axton · CommandoLegendary
The all-rounder turret mod — boosts six Commando skills with a big cooldown-rate bonus.
Legendary Engineer
Axton · CommandoLegendary
High cooldown rate; boosts Battlefront, Resourceful, Sentry, Impact and Able. Digistruct Peak drop.
Legendary Ranger
Axton · CommandoLegendary
Team shield recharge and reduced delay; boosts Ranger, Onslaught, Impact and Metal Storm.
Legendary Pointman
Axton · CommandoLegendary
Survival build — big health and health regen; boosts Pressure, Grit, Last Ditch Effort, Able and Healthy.
Slayer of Terramorphous
Axton · CommandoLegendary
+Burn damage, +ignite chance and health on top of core turret skills. Drops from Terramorphous.
Grenadier
Axton · CommandoPurple
+Grenade damage and explosive resistance; boosts Steady, Impact and Grenadier.
Legendary Siren
Maya · SirenLegendary
+45% movement speed while Phaselock is active, plus cooldown and gun damage; boosts Ward, Accelerate, Mind’s Eye, Foresight and Flicker.
Legendary Binder
Maya · SirenLegendary
Team cooldown rate; boosts Suspension, Sweet Release, Wreck, Helios and Reaper.
Legendary Cat
Maya · SirenLegendary
Huge SMG damage at the cost of accuracy; boosts Accelerate, Mind’s Eye, Wreck, Foresight and Reaper.
Legendary Nurse
Maya · SirenLegendary
Strong team health regen; boosts Restoration, Elated, Sweet Release, Sustenance and Suspension.
Slayer of Terramorphous
Maya · SirenLegendary
+Burn damage, +ignite chance and health alongside core Phaselock skills. Drops from Terramorphous.
+SMG damage, −accuracy; boosts Mind’s Eye, Wreck and Accelerate.
Legendary Gunzerker
Salvador · GunzerkerLegendary
High cooldown rate for near-permanent Gunzerk; boosts Lay Waste, All in the Reflexes, Last Longer, Yippee Ki Yay and Incite.
Legendary Berserker
Salvador · GunzerkerLegendary
+20% movement speed while Gunzerking; boosts Locked and Loaded, Quick Draw, Filled to the Brim, Hard to Kill and Incite.
Legendary Hoarder
Salvador · GunzerkerLegendary
Team ammo regen; boosts Lay Waste, 5 Shots or 6, Filled to the Brim, Locked and Loaded and Incite.
Legendary Titan
Salvador · GunzerkerLegendary
Big health regen and gun damage with a large shield penalty; boosts Hard to Kill, Out of Bubblegum, I’m the Juggernaut, Locked and Loaded and Asbestos.
Slayer of Terramorphous
Salvador · GunzerkerLegendary
+Burn damage, +ignite chance and health on top of core Gunzerk skills. Drops from Terramorphous.
Monk
Salvador · GunzerkerPurple
Dragon Keep alignment mod — weapon bonuses depend on the alignment prefix; boosts Money Shot, Asbestos and Sexual Tyrannosaurus.
Legendary Hunter
Zer0 · AssassinLegendary
Activating Decepti0n restores 10% max health; boosts Headsh0t, Fast Hands, C0unter Strike, Killing Bl0w and Ir0n Hand.
Legendary Killer
Zer0 · AssassinLegendary
+Team critical damage; boosts Headsh0t, Killer, Vel0city, Ambush and Tw0 Fang.
Legendary Ninja
Zer0 · AssassinLegendary
Large melee damage; boosts Backstab, Resurgence, Killing Bl0w, Ambush and F0ll0wthr0ugh.
Legendary Sniper
Zer0 · AssassinLegendary
+Sniper and crit damage with a shield penalty; boosts Precisi0n, 0ne Sh0t 0ne Kill, Headsh0t, Kill C0nfirmed and Vel0city.
Slayer of Terramorphous
Zer0 · AssassinLegendary
+Burn damage, +ignite chance and health alongside core sniping skills. Drops from Terramorphous.
Rogue
Zer0 · AssassinPurple
Dragon Keep alignment mod (Lawful/Neutral/Chaotic + Good/Neutral/Evil prefixes change the weapon bonus); boosts Vel0city, Tw0 Fang and Like The Wind.
Legendary Mechromancer
Gaige · MechromancerLegendary
The all-round Anarchy/Deathtrap mod — boosts six skills with high cooldown rate.
Legendary Anarchist
Gaige · MechromancerLegendary
+Gun damage, −accuracy (Anarchy synergy); boosts Unstoppable Force, Myelin, Strength of Five Gorillas, Smaller Lighter Faster and Typecast Iconoclast.
Legendary Catalyst
Gaige · MechromancerLegendary
Team elemental effect damage; boosts More Pep, Electrical Burn, Evil Enchantress, Wires Don’t Talk and Interspersed Outburst.
Legendary Roboteer
Gaige · MechromancerLegendary
Deathtrap-focused, +cooldown and melee; boosts Potent as a Pony, Made of Sterner Stuff, 20% Cooler, Strength of Five Gorillas and Annoyed Android.
Slayer of Terramorphous
Gaige · MechromancerLegendary
+Burn damage, +ignite chance and health on top of core skills. Drops from Terramorphous.
Catalyst
Gaige · MechromancerPurple
Team elemental effect damage; boosts Wires Don’t Talk, Evil Enchantress and Shock Storm.
Legendary Psycho
Krieg · PsychoLegendary
The all-round mod — boosts six skills with +burn damage, mag size and shield recharge delay.
Legendary Reaper
Krieg · PsychoLegendary
+99% team kill-skill duration; boosts Taste of Blood, Blood Overdrive, Blood Bath, Thrill of the Kill and Fuel the Fire.
Legendary Sickle
Krieg · PsychoLegendary
Large melee damage (Mania/melee build); boosts Taste of Blood, Fuel the Blood, Empty the Rage, Silence the Voices and Pain is Power.
Legendary Torch
Krieg · PsychoLegendary
Large burn damage — the Hellborn staple; boosts Embrace the Pain, Burn Baby Burn, Fuel the Fire, Elemental Elation and Flame Flare.
Slayer of Terramorphous
Krieg · PsychoLegendary
+Burn damage, +ignite chance and health alongside core skills. Drops from Terramorphous.
Toast
Krieg · PsychoPurple
Hellborn pick — +ignite chance and mag size; boosts Pain is Power, Fire Fiend and Elemental Elation.
A curated set of the staples, not every COM in the game — lootlemon has the full searchable database.