Both "Ilya" and "Illya" are official spellings of her nickname. "Ilya" is used on the TYPE-MOON's official website and in the fan translation of the game, but "Illya" tends to be used elsewhere, especially in merchandise.
Illyasviel von Einzbern Wikia Page: Citation 3
The banner looks similar to 武者幟 (warrior flag)
Around AD1600, There are civil war in Japan.
In that time every warrior show that flag to recognize each other.
Wikipedia have some picture of that war.
Or some city selling that flag as goods.
These flags have name of the 将軍 (General) or 紋(the mark of the family).
In that ilier's case, it uses same format, ...
They are character from the Nasuverse (which Fate/kalied liner Prisma Illya is set in).
From left to right
Touko Aozaki - Kara no Kyokai, Mahou Tsukai no Yoru
She is Aoko Aozaki's older sister, the one you see in the screen shot is how she looks in Mahou Tsukai no Yoru as she looks slightly different in Kara no Kyokai.
Euryale and Stheno - Fate/Hollow ...
It would appear that Archerko Illya traced Excalibur and overloaded it with prana turning it into a Broken Phantasm. Which raises the weapon's rank by one.
One would assume that the two Excaliburs would cancel each other out, but Saber Alter, unlike the typical Saber only has an Magic Resistance of Rank B since her Alignment is Lawful Evil, which might ...
Apparently, the fact that Kuro can continue to exist in the world is a miracle created by her own "wish" stated at that same part:
“I want family. I want friends. I want to live a normal, everyday life. But…more than that…more than anything…I don’t want to disappear! I just…I want to live!”
This happens because she is the grail, so she basically granted ...
Fate/kaleid liner PRISMA☆ILLYA is an alternate timeline to Fate/Stay Night
The series takes place in Fuyuki City in an alternate timeline of Fate/stay night. Kiritsugu and Irisviel helped end the Holy Grail War ritual before it could start, sealing Ilya's memories away and allowing her to grow up as a normal girl. Shirou and Ilya live a peaceful life as ...