Legend Rider Eyecons

The 16 Legend Rider Eyecons are used by Kamen Riders Heisei, Larcen, and Arcane to access their alternate Damashii forms. They contain the "essences" of the Riders they represent, not the souls of the Riders themselves. They glow very bright if the Rider they represent is in their vicinity, alerting the Ghost riders that they are there. Also, they are more often than not sealed in items that did not belong to the rider, rather within something that is associated with them. Other than this, they function identically to their historical figure-based counterparts.

Decade
The Decade Ghost Eyecon (ディケイドゴースト眼魂 (Dikeido Gōsuto Aikon) is the first Eyecon Heisei obtains. It shows the number 10 on its Startup Time setting, the Face Destroyer displaying a cracked-open circle with a barcode pattern (most likely representing a World) on its Transformation Time setting, and Decade's logo in gold on its Move Invocation Time setting.

In the Ghost Driver, it summons the Decade Ghost with the Persona Destroyer to transform Heisei into her Decade Damashii form, which allows her to use dimensional walls for defense and to evade enemy attacks. As explained by Senin, the dimension Heisei uses is an empty one that exists solely for her use, and cannot be tracked or entered.

The Decade Ghost was initially sealed in Reika's camera, which was given to her by a version of Tsukasa shortly before he disappeared.

Drive
The Drive Ghost Eyecon (ドライブゴースト眼魂 (Doraibu Gōsuto Aikon)) is the second Eyecon Heisei obtains. It shows the number 16 on its Startup Time setting, the Face Automobile displaying the hood of the Tridoron on its Transformation Time setting, and tire tracks forming an "X" on its Move Invocation Time setting.

In the Ghost Driver, it summons the Drive Ghost with the Persona Automobile to transform Heisei into her Drive Damashii form, which allows her to move at high speeds (although not as fast as Kabuto Damashii) and use the Heavy Acceleration ability (which is ironically attributed to Drive's enemies, the Roidmudes) to slow down her enemies, further increasing her own speed.

The Drive Ghost was initially sealed within a toy Tridoron owned by the police officer Rei Tenshi, which the three Drive Gear Ganma tried to free by sacrificing him. It was found by Reika, but captured by the Tridoron Ganma, which absorbed it to become the Giant Tridoron Ganma. It was freed when the Giant Ganma's power was destroyed by the Falcon Heiscooter and reverted back to a normal Ganma.

Gaim
The Gaim Ghost Eyecon (鎧武ゴースト眼魂 (Gaimu Gōsuto Aikon)) is the third Eyecon Heisei obtains. It shows the number 15 on its Startup Time setting, the Face Fruits displaying the fruits used by Gaim's four main riders (orange, banana, grapes, and melon) on its Transformation Time setting, and the inside of an orange on its Move Invocation Time setting.

In the Ghost Driver, it summons the Gaim Ghost with the Persona Fruits to transform Heisei into her Gaim Damashii form, which allows her to summon semi-corporeal "Inves" to aid her in battle and distract foes, as well as manipulate plants.

The Gaim Ghost was initially sealed inside Kouta Kazuraba's Team Gaim hoodie.

Trivia

 * When the Legend Rider Ghosts are unsealed (or when they first appear on-screen), they play their respective Rider's transformation calls as they strike their poses. Since most of these transformation calls involve someone talking, this means that they are the only Parka Ghosts to have voices.