Here is my explanation of his mech:
Star Captain Kenbarg DelVillar of Clan Ghost Bear, Beta Galaxy, 14th Battle Cluster, 76th Supernova pilots an Executioner A.
His Executioner emulates ‘The Maulers’ icon; the body is a deep gray, nearly black. The lower arms are crimson, bloodied. A blue star is prominently placed on his right shoulder.
DelVillar’s decision to break from traditional Beta Galaxy colour schemes is a testament to his desire to provide inspiration in his own forces as well as despair in enemy opposition.
Often he rides to battle accompanied by a point of elementals who defend him against conventional infantry forces and finish off downed mercenary BattleMechs.
The retaking of Terra enlightened him to the Inner Sphere and their use of mercenaries to hold their worlds. Dishonourable men and women; hiding amid the settlements and environs to ambush and employ tactics of devious nature. No longer would the 14th Battle Cluster extend batchalls or announce their forces to planets assigned to them. They deserve nothing less than the full might of Clan Ghost Bear unleashed; merciless and relentless.