One of the possible prototypes of the Iceman is the American writer Eugene O'Neill.
Eugene O'Neill is an outstanding playwright of the 20th century, winner of the Nobel Prize in Literature in 1936.
One of his most famous plays is "The Iceman Cometh".
In this play, a group of tipsy men gather in a saloon. Each of them experiences his own tragedy and suffers from disappointment. The only way for them to feel happiness and satisfaction is to get drunk and spend time in the bar.
However, Theodore "Hickey" Hickman soon appears, joyfully announcing that he no longer drinks, and encourages others to do the same. As the story progresses, Hickey becomes more and more insistent, desperately demanding that others follow his example, seeking to save them from disappointment.
His influence spreads to other characters, who begin to confess their sins and accept reality. It is implied that the only fate for the men left in the bar, stuck in their delusion, is death.
The gist of the story is that death comes to everyone, regardless of their attempts to escape reality. The character of Hickey represents the Iceman and death, encouraging people to strive for unattainable dreams in the hopes that failure will force them to face reality.
Iceman, as one of the Mafia's top assassins, also represents death.
Additionally, Hickey, who came to the bar, is acutely aware of the main conflict of each person there. Iceman is also able to detect and sense the activation of others' abilities, since in BSD, a character's abilities always reflect their main conflict.
To sum it up, it is obvious that since the Flags and Iceman in particular had no goals or dreams outside of the Port Mafia, their fate was predetermined - they were destined to die in the Port Mafia.
I take that theory from https://t.me/Lippmann_Altar