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If I have a character that's both an Autobot and a Decepticon, does my starting team have "only Autobots"?

No. In order to qualify as "only Autobots," your starting deck can't have any characters that are another faction (even if they're also Autobots).
Source: Wizards of the Coast (2020-05-09)    【Link to Ruling】
Tags: Head, Body