THE BACKSHOT DEMON: Fifth Victim

Nobody got the previous one.

Anyways:

Solve this riddle to find,

The victim I have in mind.

In youth, I am fleeting, yet in age, I am wise, Through laughter and tears, my story complies. I stand in the crowd, yet I'm never the same, A character woven in life's intricate game.

In echoes of past, my presence is felt, In whispers and secrets, in cards I've been dealt. Who am I, this figure of arc? Unlock the mystery, embark on your lark.

Within the daylight, yet shrouded in night, A puzzle to solve, a seeker's delight. With every clue found, the puzzle's remark, Decipher the enigma, unravel the spark.

What am I?