The Eggwalker takes the appearance of the Egg Mobile, but with extra features. It has a rifle-shaped Volkan Cannon on the right side of the cockpit and a large and elevated Lock-On Missile launcher on the left side of the rear. On the bottom, it is equipped with two heavily armored legs.
The Eggwalker can wear a number of Outfits in the games' multiplayer mode. When worn, they change the Eggwalker's appearance to match the Outfit's theme amongst other things. These Outfits include:
Camouflage (Sonic Adventure 2): Unlocked in Sonic Adventure 2 after clearing all of Dr. Eggman's missions. The Eggwalker is given brown military camouflage paint.
Halloween Theme: A VMU downloadable Outfit on the Dreamcast version of Sonic Adventure 2 available from the United States' version of the game's official website starting on October 11, 2001. The Eggwalker is given plating resembling a Halloween pumpkin.
Christmas Theme: A VMU downloadable Outfit on the Dreamcast version of Sonic Adventure 2 available from the United States' version of the game's official website starting on November 30, 2001. The Eggwalker's color scheme is changed to primarily white and red.
Camouflage (Sonic Adventure 2: Battle): Unlocked in Sonic Adventure 2: Battle after clearing all Dr. Eggman's missions with an A Rank. The Eggwalker is given a complete gray military camouflage paint and Eggman wears a black soldier uniform. When wearing it, the Lock-on is deactivated but the Power Laser can be performed every ten Rings.
The Eggwalker is a powerful mech vehicle, capable of overpowering all kinds of robot drones deployed by GUN and military defenses, and going toe-to-toe with Tails' Cyclone. It is armed with various weapons, including the Volkan Cannon mini-gun, a laser target, and two kinds of missile launchers which can either shoot homing missiles at locked targets or missile barrages. Its most potent weapon, however, is a large multi-colored laser which it can fire from the front.
The Eggwalker makes an appearance in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. When Dr. Eggman decided that he would personally take out the G.U.N. Aircraft carrier, he used his wrecked Eggmobile in order to build an Eggwalker with two side seats for Orbot and Cubot. After destroying many of the G.U.N. forces on the carrier, Eggman escaped and had his Eggwalker detonate, sinking the craft.
Eggman further references Sonic Adventure 2 while he is escaping, stating "Now you know why I am the best!", which is what he would say after getting an A-rank.