Gollum

Gollum was a name used by Rose Tyler to refer to Chip, the servant of Lady Cassandra O'Brien.Δ17. (TV: New Earth)

Clyde Langer called Commander Kaagh Gollum. (PROSE: The Last Sontaran)

Behind the scenes

 * Although not mentioned in the DWU, Gollum is a character from The Lord of the Rings.
 * Gollum appeared as a playable character in LEGO Dimensions.

References in invalid sources
Gollum was in a cave when he noticed a ring, which he referred to as his "precious", running towards it before it was swiped away by Sonic the Hedgehog. (NOTVALID: New Adventures Await!)