When choosing a personality for your character, there are many ways to go about it. While some might call my method cheating, I find it to be a more realistic and easy means of describing what your character is like.
Basic Portrait
Myers Briggs is now your best friend. The Myers Briggs indicator is an absolutely brilliant and quite wonderful classification of basic personality portraits, based on a set of four basic traits. While you might be skeptical at first, the accuracy of this indicator may astonish you. Your first step now is to take this test as accurately as you can as it pertains to your new OC, and find out what basic four-letter portrait your character has.

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How To: Making A Transformers OC
Random----Disclaimer---- //..This is not mine, I found it on DeviantArt, so credit goes to that person, but it seems helpful enough for people who wanna create an OC..// Oftentimes when someone is introduced to a fandom and they turn out to become big f...