Butane9000, on 06 January 2013 - 09:58 AM, said:
Atlas D-DC
Cataphract 3L, 4X
Centurion AH (?)
Commando 1B
Dragon 5N
Flea 17, 19 (?)
Highlander 732
Jagermech DD
Trebuchet 3C
Unlisted Variants (lore approved, MWO denied)
Hunchback 4N
Trebuchet 5S
Raven 3X, 1X
Steiner
Atlas D-DC
Commando 1B
Marik
Trebuchet 5S (I know it says "S" but this is one of those exceptions to the rule. The 5S was largely used by House Marik though being bordering nations it was not uncommon to see this variant on both sides.
Davion
Cataphract 4X (First protype after the capture of Tikonov. Poorly received by Federated Suns pilots and never truly used.)
Trebuchet 3C (This is the original "Trenchbucket" built during the Star League by Corean Enterprises for the Federated Suns.)
Centurion AH (Removed from MWO)
Jagermech DD (While this variant is inherently Davion, the Jagermech is widely used by most of the Great Houses.)
Laio
Cataphract 3L
Flea 17 (Production plans captured from Wolf's Dragoons and re-engineered in 3040.)
Raven 1X (The original Prototype put into production that eventually became what is the 3L. These models were captured by House Davion in the 4th War and upgraded to the 2X which you can place on their list as well.)
Raven 3X (This is House Liao's epic failure. The 'Mech mounts faulty production grade Triple Strength Myomer that causes it to burst into flames when exposed to a certain gas. The completed version of this variant uses experimental level 3 tech.)
Kurita
Dragon 5N
Mercs/General
Flea 17 (Wolf's Dragoons)
Flea 19 (Peripher States and Merc units)
Hunchback 4N
Highlander 732 (This is the original Highlander, manufactured by House Liao during the Star League era. It is prominent in House Liao and Steiner however, it's lore places it in small numbers across each Great House over the course of this timeline due to numerous circumstance. So this is why I placed it here.)
Hope this helps, it gives me something to do other than endlessly play conquest mode in my least favorite 'Mechs to grind.