I have quite a substantial collection of Hero Mechs in MWO.

Light

• Arctic Cheetah – Shard
• Commando – Death’s Knell
• Firestarter – Firestorm
• Locust – Pirate’s Bane
• Urbanmech – Streetcleaner

Medium

• Cicada – The X-5
• Centurion – Yen-Lo Wang
• Griffin – Ares
• Hunchback – Gridiron
• Nova – Breaker
• Shadow Cat – Mishipeshu
• Viper – Medusa

Heavy

• Cataphract – Ilya Muromets
• Ebon Januar – Espirit de Corps
• Jaegermech – Firebrand
• Mad Dog – Revenant
• Orion IIC – Sköll
• Rifleman – Dao Breaker
• Summoner – Pride
• Timber Wolf – Warrant

Assault

• Atlas – Kraken
• Banshee – Siren
• Blood Asp – Rancor
• Cyclops – Sleipnir
• Direwolf – Ultraviolet
• Executioner – Cherbi
• Highlander – Heavy Metal
• Kodiak – Spirit Bear
• Marauder II – Alpha
• Stalker – Misery
• Victor – Dragon Slayer