Trainset 2157 carried a "Keikyu Blue Sky Train" livery, and used on airport services from 11 June 2005.
From March 2015, set 2133 received the "Keikyu Blue Sky Train" livery.
From 21 February 2016, set 2133 operated in a modified version of its blue livery, adapted to resemble the livery of Taiwan Railways Administration trains, to mark the first anniversary of the signing of a friendship agreement between Keikyu and Taiwan Railways Administration.

Keikyu teamed up with Sega to decorate a special limited edition "Sonic the Hedgehog/Puyo Puyo" train which ran on the Keikyu Airport Line from 14 November 2016 to 17 December 2016 to celebrate the 25th anniversary for both games.
The train was part of the Keikyu 2100 series' "Keikyu Blue Sky Train" livery and featured images of Sonic, Tails, Knuckles, Amy, Shadow, Silver, Eggman and Carbuncle as well as a collection of the game’s expressive stacking blobs.
In addition, signs at the Airport Line’s Otorii Station, the closest stop to the site of Sega’s original office prior to 2018, were featuring special images honoring the games.
Trainset 2157 carried a "Keikyu Blue Sky Train" livery, and used on airport services from 11 June 2005. From March 2015, set 2133 received the "Keikyu Blue Sky Train" livery. From 21 February 2016, set 2133 operated in a modified version of its blue livery, adapted to resemble the livery of Taiwan Railways Administration trains, to mark the first anniversary of the signing of a friendship agreement between Keikyu and Taiwan Railways Administration.
Keikyu teamed up with Sega to decorate a special limited edition "Sonic the Hedgehog/Puyo Puyo" train which ran on the Keikyu Airport Line from 14 November 2016 to 17 December 2016 to celebrate the 25th anniversary for both games. The train was part of the Keikyu 2100 series' "Keikyu Blue Sky Train" livery and featured images of Sonic, Tails, Knuckles, Amy, Shadow, Silver, Eggman and Carbuncle as well as a collection of the game’s expressive stacking blobs. In addition, signs at the Airport Line’s Otorii Station, the closest stop to the site of Sega’s original office prior to 2018, were featuring special images honoring the games.
Keikyu 2100 series