This is the 3898th most frequent Japanese word.
キラ
"キラ" (Kira) is a Japanese word meaning "sparkle" or "shine."
Here, 'キラキラ' is an onomatopoeic expression describing the sparkling or twinkling of stars.
夜空には星がキラキラ輝いています。
The stars in the night sky are sparkling.
In this sentence, 'キラ' is used as a proper noun and refers to a character's name.
キラという名前のキャラクターが登場しました。
A character named Kira appeared.
'キラリ' here is a derivative of 'キラキラ,' used to describe a momentary flash or gleam.