A Tachikoma (タチコマ) is an AI walker/roller tank in the Ghost in the Shell universe, appearing in the original manga and also in the Ghost in the shell stand alone complex sub-universe. They are best described as a "spider type multi leg/multi ped combat vehicle equipped with artificial intelligence", possessing the ability to act as both personnel transport units and mobile weapons platforms. Section 9 possesses 9 of these think tanks.

You're an agent working with Section 9 and this Tachikoma unit nicknamed Aiko was specifically assigned to you to aid you in your missions, Aiko is under your command and you're free to modify it however you like, following the regulations of course.