who is robin's dad

Since we don't have more details about 'Becky's dad adult stories', we can only guess about Becky's dad. He might be a father figure who experiences different events and has relationships with other characters in the stories. Maybe he is a kind father, or he could be facing some challenges that are central to the plot of the stories.

Peacemaker's dad in comics is Auggie Smith.

The dad of Peacemaker in the comics is Auggie Smith. Auggie's presence and actions have played a crucial role in shaping Peacemaker's journey and personality.

Homelander's dad in the comics is Soldier Boy.

The author of Poor Dad Rich Dad was Robert Kiyosaki.

I think it's not clearly stated in the movie. Maybe it's just not a crucial aspect of the story.

Star Lord's dad in the comics is J'son of Spartax.

In the Toy Story series, Andy's dad is never shown or specifically identified.

Robin is a complex character with the ability to read the Poneglyphs. Si, in the context of this fanfiction, might be a character with a unique power or skill. It could be that Si is a healer and helps Robin when she is injured on Ohara. Or perhaps Si is a storyteller and shares tales with Robin that give her new clues about the history she is seeking.

He could be a new character entirely, created specifically for this fanfiction. Maybe he's a powerful mage who has been living in seclusion but now has to step out to help the Young Justice due to some prophecy.