Do Northern Irish Consider Themselves Irish?

People in Northern Ireland are de jure "British". There's no word for "UKish", and Northern Irish people have the same passports as everyone else in the UK. Unionists generally regard themselves as British and Irish, in the same way English people are English and British or Scots are Scottish and British.

Do people from Northern Ireland have an Irish accent?

Northern Irish accents have two major historical influences acting on them that make them unique from those of the Republic of Ireland or elsewhere. These are from Scotland and from the English North and Midlands.

Is a Northern Irish person British?

Residents of Northern Ireland, like all other residents of the United Kingdom, have British citizenship. Therefore we can say that those in the North are British. However, Northern Ireland is still located on the island of Ireland. The inhabitants of the island are called the Irish.