Irish republicanism is totally different to republicanism in general, it shouldn't even be mentioned in the same sentence.
What's republicanism in general? Obviously American republicanism is entirely different, and it can be meant in an abolish the monarchy sense, but why does 'republicanism in general' become so different when it's Irish? Are they naturally inclined to violence or something?
I'm interested in knowing what this united Ireland through peaceful means entails

. I admit, the words alone sound so beautiful and democratic that it could deceive the most scholarly man, but the real reality isn't so clear. The Ulster-Scot people of Ulster for almost 2 millennium have said no to a united Ireland. They were always the last to resist any type of Union with the rest of the island. Why do you still want to force this issue upon them? Why can't you just accept that they don't want to unite with the Republic? Why do you keep on thinking no means yes?
The same could be asked about unionism. Either you want to keep unionism in place by peaceful means, or by violent means. Clearly, if you're opposed to violence, only peaceful means remain. But by your way of thinking, this could never work, because there are people who oppose unionism.
The British had no business being in Ireland in the first place. The north should have been given back in 1921.
If you still keep on insisting that we have to unite with yous, what guarantee can you give that our identity, culture and heritage will not be eroded or swamped with that of the Oirish? For instance, will we have to call ourselves Irish Ulster-Scots, instead of our real identity Brythonic Ulster-Scots?
Your use of the word 'Orish' seems slightly tainted with rascism to me. A few points:
1. Cultures can and do peacefully co-exist, without one swamping the other. I'd like to see all cultures in the north represented.
2. The Irish have experienced quite a bit of the old culture-swamping themselves. For many hundreds of years. At the end of it all, though, they've retained a very distinctive culture.
3. Culture is something which changes with time anyway. Every single culture has influenced and been influenced by other cultures.
4. Nobody's proposing that a united Ireland would be some sort of police state. Everyone would be allowed to express their culture.
Let's hear a more in depth response to your phrase 'I do support a united Ireland, but through peaceful means.'...it's easy to say what you want, how are you going to achieve it?
You're making it sound like that to be in favour of a united Ireland, you're either in favour of violence as well, and therefore a terrorist, or you're a bit dim, because there's no way of acheiving it through peaceful means. Negotiation and debate is the way to go- a huge amount can be changed without using violence. India got indepence through civil disobedience, but in a non-violent way.