There are certain contractions I never use in speech, and it shows up in my writing. For example, if you ever see a character saying "I am" in my writing, it's usually not their speech quirk, but mine. Same thing with "I will" or anything with "will." I think Anon pointed out a character's speech before and said it was robotic because she said "I am." Nope. That's just me. Maybe I am a robopire?