TC-ST312 is a TC-Series protocol droid under the ownership of Star Tours and is found at the main spaceport in Coronet City, Corellia.
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I felt that Star Tours should have their own protocol droids in the company colors, so I came up with this. The ST part within TC-ST312 stands for Star Tours while this droid in particular is the 312th TC-Series protocol droid in use by Star Tours.