NinjaCelts appeared halfway through the first millenium A.D. The earliest documented records place them in Ko-Nemara, an ancient Japanese settlement on the western coast of Ireland.
(It's there, dammit. :/ Look it up.)
During centuries of bitter tribal warfare, chieftains of feuding clans hired Ninja Celts as assassins and spies, until these fierce Hiberno-Asians developed a bloodthirsty reputation.
Their chilling brutality is detailed in contemporary accounts:
"And besides these, Aillil my husband
Fifteen hundred I have in pay
The terror of Ko-Nemara
Stealthy-footed warriors of the night
Dealers of death more fearsome than the Morrigan
And unlike Connaughtmen,
They work for union scale.
"So shut up about Cuchulainn already;
He'll toss his bannocks at the mention of their name
Soiling his trews most abundantly withal,
And yielding the field in all expedience.
So there."
---Queen Medbh, "Tain Bo Cuailnge"
Between raids, Ninja Celts honed their deadly skills with traditional games of the mysterious Far East---
---hurling, tossing the caber, rugby.
They also enjoyed the fine arts of high culture.
Like all their countrymen, Ninja Celts were passionately gifted and eloquent poets.
The delicacy of their haikus echoes a deep love of natural beauty, as evidenced in the following haunting verses:
"Creeping little feet
Like cherry blossoms drifting
Silent, soft, secret...
"Lurking in shadow
Black as peat from Leinster bog:
Sneaky Ninja Celt.
"Always far away
By the time the screams begin---
Cursedly clever!
"Enlightened man knows,
When Ninja's eyes are smiling....
Your kin shall die soon."
