Alineofalternate-universeTransformerscomics published by IDW. The first story arc, [[Hearts of Steel]],putsforth a reality where the Transformers awakened in industrial revolution-era USA; [[OptimusPrime]] and others become steam locomotives, while [[Megatron]] is a giant wheeled cannon instead of a pistol. Or... tank. Or jet plane, or race car, or two headed dragon... eh, you get the idea.
Drillhorn is the veteran strategist amongst the Breastforce group. He can be quite opinionated, and his flaw rests in his adherence to past battle experiences. His Breastforce partner is Rhinobreast and he transforms into a drill tank, combining with the other Breastforce members to form Liokaiser.