I used to type with an emote immediately after a sentence. Any emote really.
IDK if it counts as a typing quirk... But I say oh a lot.
Instead of I see, or uh huh. (I got that from my American friend offsite)
I use a lot of Australian slang in my typing or speech patterns.
Most of which came about in primary, high school.
Lastly... I often show little emotion or seem depressed when I post, but I am not as so in actuality.