[citation needed] The front portion is made of steel painted ivory white.

[citation needed] The 9030 series sets differ from the earlier 8-car sets in having UV-cutting glass for the wide windows, eliminating the need for roller blinds, and having full-colour LED destination indicator panels.

[2] From 1 November 2018, 9000 series set 9731 was wrapped in a pink livery incorporating several Sanrio characters, such as Hello Kitty.

[4] On 7 February 2025, Keio announced that its 10-car 9000 series fleet would undergo a programme of refurbishment.

The work includes a renovated interior incorporating some design elements of the to-be-introduced 2000 series, with additional stanchion poles, dimpled stanchion poles for priority seats for improved grip, and wheelchair- and stroller-accessible "free spaces" in all cars.