Lothan received an entry in the 2016 tie-in book "Tobin's Spirit Guide - Official Ghostbusters Edition" on page 76, in Section IV: Gods and Mayor Demons. It is identified as a Class VI Harbinger of Catastrophic Destruction.
After the ghost whale takes a lap around the firehouse, the Extreme Ghostbusters go outside to investigate. The No Ghost logo on the sign on the firehouse is the original design for this series, with rivets in it.