The first inhabitants of Ireland were a Cro-Magnon people called the "Fomorians." They were of Berber ancestry from northwest Africa. Other tribes that invaded the island were the Fir Bolgs and Tuatha de Danaan. I don't know much about those two. Here are some famous Gaels of Fomorian ancestry:
Around 1350 BC, Scota (real name "Meritaten"), the daughter of Pharaoh Akhenaten and half-sister of Tutankhamen, led a band of Egyptians to Ireland via Spain. Egyptians who stayed in Spain settled in what is now Portugal. Some of the Iberians of Spain migrated to Ireland along with the Egyptians. That's probably where the name "Hibernia" (another name for Ireland) came from. She was killed in a battle with the indigenous people there.
After her death, her descendants went on to become the high kings of Ireland at Tara in the county Meath. Around 500 AD, they then invaded Scotland (see the resemblance of "Scota" and "Scotland?"). Bagpipes were probably of Egyptian origin. The Egyptians may be the reason some Irish people have curly hair and protruding jaws. Egypt consisted of both blacks and whites.
Her husband was a Scythian named "Mil" (where "Milesian," another name for the pre-Celtic natives of Ireland, came from). Scota was probably named after Mil's ethnicity. Here are some famous Gaels of Iberian ancestry:
Then around 400 BC, the Celts invaded and made the Irish people Celtic. Then during the darkages the Vikings and Normans. And finally, the English... the ones who treated the Irish a lot worse compared to all the other invaders. Before the Celts, Normans, and English, the Irish were darker in complexion. After mixing with the Nordic invaders, the Irish became whiter. But they still have some traits that came from north Africa: protruding jaw and curly hair. Since the Fomorians are descendants of the Berbers, and the Berbers are Cro-Magnon mixed with blacks.