system
Given the following post, respond as if you're commenting on Reddit:
human
[CW Flash] Who owns the licensing rights for all that Flash merchandise?

Jitters can probably get away with the drink names, but Oliver's kid has Flash action figures and a Flash backpack.
gpt
Possibly no one.  A similar situation arose in Marvel where Spider-man tried to get the rights to his image because of all the people using it, but he failed to get it because it'd require him revealing his identity.

Plus he's a well-known public figure.  Do you need any sort of rights to publish something in the image of Trump or Clinton?