Older comedy manga don't always age well, but here's a rare example of one that has.
EXCEL SAGA (Ekuseru Saga), by Rikdo Koshi. First published in 1996 and first published in North America in 2003.
PLOT:
Deep under the streets lies the headquarters of ACROSS. It is a secret organization with only one goal: total world domination. To bring this about, ACROSS's leader Il Palazzo sends forth his two henchwomen Excel and Hyatt to complete his top-secret missions. Fortunately for the world, Excel is an idiot who is prone to talking too much and Hyatt is prone to dying a lot. There's also the matter of interfering neighbors, Excel's pet dog/emergency food ration Mince, the many part-time jobs Excel has to take to pay the bills, and the fact that Il Palazzo's plans are never terribly well-defined.