Override is a mysterious entity in the series. Not much is known about him.

Unknown:
Nothing much is known about his abilities just yet, although he seemed to be able to teleport. It’s also possible that he is able to enter a specific person’s field of vision and stop time.

• Override has a much bigger role than you might think.

• When he appeared during Yan and Mike’s fight, only Yan could see and feel Override’s presence, Mike had absolutely no idea.

• Override was pointing Mike’s notebook because earlier in the episode, Mike was seemingly writing down information he gained about the location of the lookout camp by interrogating Zero.  It’s safe to assume that Override knew this and had to let Yan and the group get that information.