Pokémon-themed bedroom doesn't belong to a child, or a teen, but a 40 y.o. man-child who is also sometimes a "Mantine" (Gen 2 Pokémon pronounced 'man-teen.') If this doesn't scream "Neckbeard!," then I don't know what it screams.

This guy tries to live like he's 25 in public, but from as young as four to seven to as old as 12 to 19 in private. Depending on the place, mood and the time of day, he will feel like an adult, or a teen, or a child.

He will not be afraid to wear Pokemon clothes in public, although sometimes he covers up his Pokemon shirts with a hoodie or a jacket.

As you can see in the laundry hamper photos, and the laundry hamper itself is also Pokemon themed, he also wears Pokemon themed boxers, which he calls funderwear.

He tries to relive happier times, and a more ideal childhood that he never got to have.

Would you concur that this all constitutes neckbeardly Tendencies and behavior? If all of this does not constitute neckbeardly Tendencies and behavior, then I don't know what it constitutes.