best mettaton EX headcanons:
- hair is actually solid metal
- 3-fingered mickey mouse-esque hands
- no elbows, just straight up noodle arms
- is missing an eye and has his hair covering it up because alphys is one of those artists that suck at drawing the other eye
- can produce stock sound effects from his chest speaker (like canned laughter/applause, klaxon noises, etc) and does it in normal conversation constantly
- makes the metal gear “!” sound effect when you startle him