While Kei car standards had been altered for 1990, allowing for a 10 cm (3.9 in) increase in length and an increase in displacement to 660 cc, the Toppo, being developed before the new regulations were finalized, was unable to take full advantage of these and ended up 4 cm (1.6 in) shorter than other kei cars.

Commercial use models and the lower-end passenger versions received a carburetted SOHC engine with 40 PS (29 kW) at 6000 rpm.

[9] Aside from various special equipment such as power steering, power windows, a rooftop spoiler, fog lamps, and special interior fabrics, the Q坊 received two-tone paint in two different combinations: San Marino Yellow with Sophia White roof, or Ivy Green with a Pearl White roof.

Another special edition was the Minica Toppo Flower Express of March 1991, a two-seater van with blanked rear side windows especially aimed at florists.

The passenger car models benefitted from side impact protection in the doors, steering wheel locks, seat belt reminders, non-asbestos gaskets, and more.

[3] Some models received 3-point belts in the rear seats as well, not a standard item in kei cars until the end of the decade.

[11] A version with larger bumpers and fenders and a 1.1-litre engine, the Toppo BJ Wide, was also built from January 1999 until March 2001.

[12] It could be considered a facelift of the third generation, as the door panels and many other sheet metal pieces were unchanged.