There are several different thing you need to be an actual superhero.
* They fight evil in some manner
* They have abilities that set them apart from normal people (special weapons and equipment fall into this category.)
* They have a distinct costume or look that sets them apart from normal people
* They wear a mask or otherwise wise have a secret identity.
Any character that has all four going for them is obviously a superhero.
Most characters that have three categories going for them easily fit into the superhero mold.
Two is pushing it.