I Accidentally Became Batman's Favorite Robin

Guan Luo leaped into Bruce Wayne's arms, rubbing against his slightly stubbled chin as he taunted the Robins:

"Hahaha! Batman's favorite Robin has arrived! All of you, move aside!"

The first Robin, and now Nightwing, big brother Dick Grayson, shrugged fondly and laughed. "Oh, that's not necessarily true, little starfish."

The second Robin, and now Red Hood, second brother Jason Todd, scoffed mockingly. "What, Bruce? Have you gone from collecting little boys to adopting aliens?"

The third Robin, and now Red Robin, third brother Tim Drake, sipped his coffee, dark circles under his eyes. "This has to be a hallucination from staying up too late. An alien whose real body looks like a starfish is now a human kid and wants to be Robin... Ha."

The current Robin, Batman's biological son Damian Wayne, was so furious he was just short of throwing a batarang at the kid's face. (He would have, if the kid weren't clinging to his father.) The veins at his temples throbbed as he spat, "Get lost!"

Guan Luo immediately wrapped both arms more tightly around Bruce Wayne's neck, acting all weak and pitiful as he said:

"Boo-hoo... Daddy, look at them! They're so mean, they're so scary! I'm not like them. I only know how to care about you!"

* The protagonist is a nonhuman being with no defined gender.

* No romance. Focuses on the Bat-family and their platonic relationships, with a slight focus on the father figure.

* Cover illustration from Picrew "Onaka suita" by @purin.

Theme: A nonhuman being who is Batman's favorite Robin