You have to hand it to actor Matthew Gray Gubler: When he goes, he goes all-in.

That’s whether he’s chasing serial killers on CBS’ “Criminal Minds” or putting the word out about his new children’s book.

To publicize “Rumple Buttercup: A Story of Bananas, Belonging and Being Yourself,” Gubler donned a full-body costume of his character, a peculiar green monster who hides because he fears he’s weird.

This April 1, 2019 photo shows actor and author Matthew Gray Gubler poses for a portrait in New York wearing a costume of his title character in his children's book
This April 1, 2019 photo shows actor and author Matthew Gray Gubler poses for a portrait in New York wearing a costume of his title character in his children’s book “Rumple Buttercup: A Story of Bananas, Belonging and Being Yourself. (Photo by Brian Ach/Invision/AP)

The story centers on the lonely Rumple Buttercup, who hides from the world because he has crooked teeth, three hairs and an asymmetrical body.

Gubler says he wrote the “book for anyone that feels like they don’t quite fit in.”

While promoting his children’s book, “Rumple Buttercup,” “Criminal Minds” actor Matthew Gray Gubler says he hopes to use his art and creativity to appeal to outsiders. (April 14)
While promoting his children’s book, “Rumple Buttercup,” “Criminal Minds” actor Matthew Gray Gubler says he hopes to use his art and creativity to appeal to outsiders. (April 14)

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