Autobots are
living beings, sometimes referred to as "bio-mechanical" and often depicted as being forged from the same "living metal" that makes up their home planet Cybertron. This living metal can heal, grow, and regenerate like organic cell structures. and is unique to each transformer, granting them their basic personality and influencing certain physical traits. while other media portrays the source to be an ancient artifact simply called the "Allspark". Some stories have shown characters being able to preserve a dead transformer's spark under the right circumstances, allowing that fallen transformer to return in a repaired body (though this possibility involves great risk and becomes more unlikely as more time passes). are unique, difficult to upgrade, and can permanently affect or disable a transformer, as well as threaten their life, if seriously damaged. Some transformers, including several Autobots, have traits that make them part of a subset of their species. Transformers who are so massive in size they are able to convert into fortresses or cities are known as Titans, some of whom (such as
Metroplex) have allied themselves with the Autobots. "City-speakers" are transformers able to uniquely commune with Titans, such as the Autobot called
Windblade. Like the Decepticons, the Autobots include "combiners" in their ranks, transformers who are able to merge with other specific transformers and become a gestalt, super-robot with greater power and its own distinct personality. In some stories, transformers are given the ability to become combiners by an ancient artifact called the Enigma of Combination. In Cybertron's past, the Guardian Robots were large scale Transformers (though not as large as the Titans) who enforced authority and peace on their planet. While most Guardians are gone, one known as
Omega Supreme serves alongside the Autobots. Mini-Cons (sometimes spelled Minicons) are small, human-sized transformers and, in some stories, are able to increase the power of larger transformers with whom they merge. Due to their biological and sentient nature, Autobots are people, although humans constantly fail to acknowledge this due to their metal composition. ==Home planet==