Army of One

In modern games this tends to be lampshaded with the enemies (and possibly allies) expressing disbelief and even fear upon learning of a single man, woman, or whatever-you-are killing company after company of their fellow mooks.

In older games this was largely made due to technical limitations, though often enough this is simply done for sake of coolness or feeding the munchkin inside every (male?) gamer.

Shmups should NOT be tagged as this is the norm in them.

Related:
* High fantasy (a.k.a. epic fantasy)

Contrast:
* One of Many
* Group