[hider=To save room][hider=Too much text]Hmmm, from what I expect of Kyle and the personality that I imagine for him it would be unknown that there would be a cop with superpowers unless a criminal escaped being apprehended by him during a very public and blunt display of magic or other people watching him do his thing on-duty. His use of magic on-duty is limited to mostly subtle things but in this case at Devil' Square, it's a more flashier incident that what he regularly does at work.

He also does his entire if not most of his vigilante stuff off-duty so that his police work and well... miscellaneous work don't mix up into some nasty business where someone has figure out who he is. However, that would be unlikely as Kyle doesn't really have an alias to tag his deeds to be recognized so it's pretty hard to find him. With nothing defining on what his 'persona' is as well, makes it annoyingly hard to track from an event-to-event basis as he could be wearing anything unless you plan stalking him 24/7 daily. With the prompt of asking who he is, he simply claims to be 'a good samaritan' which sooner or latter might as well just become his vigilante nickname if his activities start getting too noticeable while continuing to not leave anything he does attached to anything (I might just do that lol).

Stacking on top of that is the fact that any bystanders who see him use magic are 'convinced' (via magical means) that something else (more normal) happened so his identity/powers remain hidden (it's also a free therapy session for the victim in the incident as well). So general, he is a completely unknown no doubt and will probably remain so as his desire to remain unknown is pretty strong. 
[hider=tldr]Nobody knows him or about his vigilante experience as he's just a good anonymous samaritan who doesn't want to be recognized and takes measure to remain so[/hider][/hider][/hider]