Hobgoblins are C ranked monsters.
Their average height is around 180cm.
When male goblins evolve they become hobgoblins, while females become goblina. They quickly develop superior intellect and memorization. Also, their constitution and strength improve. Their fertility is depleted, but in exchange for it, their lifespan has been extended.
Their ranks vary; equipment and armor, individual class and skills, and other such factors greatly affect the rank. After all, individual strength depends on the individual.
The four Rimuru designated as goblin lords, are stronger than the rest. And Rigurdo, whom he crowned Goblin King, has reached B rank.
Hobgoblins get sick.