I recently acquired a collected comics edition of the old
Blimey! It's Slimer mini strips that used to appear in the weekly
Real Ghostbusters comic, published by Marvel UK. Each strip was mainly half an A4-sized page, but later promoted to a whole page in some issues.
This version of Slimer has its own unique take and on off extra characters exclusive to the canon. Mainly, this was just a humor slot like the newspaper funnies.