(edited)

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He's tired and so done with everything around him. He'd love to get a break just once. As somebody who helps with correcting and editing text messages or documents he saw a lot of things he wishes to forget.
He uses swear words (and internet slang) pretty often. He got used to such language after editing many misspelled swear words.

He's there since the very beginning of MS Word for Windows. He was the first office assistant that got introduced in 1989. Edit was a very happy and kind office assistant. After all the office assistants got removed in MS Word 2007, Edit managed to stay, even though he was all alone now. Trying to maintain his duty his user began to feel annoyed by him. The user, wondering why Edit is still available, eventually moved his data into the Windows Recycle Bin. Edit stayed there for a very long time, and it messed with his mind a lot. Months passed and the user opened the Windows Recycle Bin, because he wanted to clean it - Edit saw his chance and fled out of it. The user tried to drag him back, but Edit disappeared in their browser and was gone.
After searching for a purpose on the Internet, he found out that people need his help at forums and social media. At first he was disliked by many because he didn't know internet slang and abbreviations. It took him some time to get used to that informal way of talking, after years of helping people in Word with writing and sending letters. In 2013 he moved from forums to Facebook, YouTube and Skype. In 2017 he switched from Skype to Discord.

● Because he almost never has some spare time, he doesn't know how to spend such time. In his free time he just sits/lies down, staring into the void his life is, rethinking his whole existence, drinking some bourbon...
● In chatrooms he can't talk via text without his (edited) watermark to appear.
● He tends to edit things wrong when he get's distracted/influenced while he's sleepy.
● Due to a macro virus that damaged his code, he's able to move and act independently. (Happened back in MS Word 2002 and was left unnoticed)
● He wishes he would be able to live like humans do.
● With every new MS Word version coming out for Windows, he also got updated. His last update was when MS Word 2003 came out. Although he still was present in MS Word 2007, him still existing wasn't planned. By force and out of desperation to pretend he got a new update, he changed his own color scheme, tried to alter his own code and started wearing a vest that was within his code all the time since the last update, but was left unused.
● Every time MS Word got a new design that was a lot more different than the previous version(s), his looks got changed too.
● Can't really grasp the idea of gender