only if you are going to Northern Ireland, you need a passport to travel between England and Ireland.
Yes they do need a passport for Northern Ireland
If you are travelling from the USA to Northern Ireland, you need a passport to go there. You probably will also need a visa to enter Northern Ireland but you can find this out if you look up the British government website.
No.
No
No. You don't need a passport to go to any part of Ireland from anywhere in the UK. However, due to increased security in recent years, you can't board an aircraft without an acceptable form of photo ID and a current passport is the best form of ID. If you are travelling by ferry, you won't need a passport, but it is advisable to check with whichever carrier you are planning to use as the rules could change.
A photo identification is necessary to fly from England to Northern Ireland. The airlines prefer a driver's license or passport identification picture. The passport is not necessary if the person flying is a citizen of either country.
That will depend on your nationality. Irish and British citizens can travel between Ireland and Britain without needing a passport, though many will bring their passport with them anyway. If you are not from Ireland or Britain, then you will need a passport, and may even need a visa.
Yes, your passport.
Yes, you need your passport.
No. You need a visa to go to England as a Malawian citizen.
Not if they're travelling from Northern Ireland, but from anywhere else he/she does.