60 Ton Inner Sphere Mech: Argus

100 Ton Clan Mech: Bane

40 Ton Inner Sphere Mech: Battle Cobra

70 Ton Inner Sphere Mech: Battle Axe

60 Ton Inner Sphere Mech: Bellerophon

50 Ton Clan Mech: Black Hawk
I have no idea how this mech would even work.

55 Ton Clan Mech: Black Lanner (This thing's supposed to be in Wave 4?)
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75 Ton Clan Mech: Black Python

35 Ton Inner Sphere Mech: Blade
50 Ton Inner Sphere Mech: Blitzkrieg
It's a mech that goes 118 kph, with an ultra AC/20, in a turret. (And Inner Sphere)

90 Ton Clan Mech: Blood Asp

85 Ton Clan Mech: Blood Kite
It's made of missiles, almost literally.

50 Ton inner Sphere Mech: Bombard
Dual AC/20s at 32 kph

70 Ton Clan Mech: Bowman
It's a Clan Catapult

80 Ton Clan Mech: Bruin

25 Ton Mixed Tech Mech: Cephalus

40 Ton Inner Sphere Mech: Chimera
Derp

95 Ton Inner Sphere Mech: Colossus
King Crab +

55 Ton Clan Mech: Dark Crow
Waist Guns

I'll probably add more later. (If you didn't notice this is alphabetical order)