It may come to be surprise but Tarn quite likes humans and their culture, mainly because he accidentally found out Nickel loves it and was trying to hide that fact because Tarn was against it. Now they both engage in various activities like crocheting.
He had a younger sibling by the name Eternity, they were kinda like a little sister to him who was acquainted with Shockwave. Because Shockwave wasn't capable of saving Eternity from heat of aggressive battle Tarn blames him for loss of his sis and swears he will average her death.
Tarn actually has the ability to shut down about 200 beings at once using his voice, he just hasn't reached such potential due to lack of training.
He has names of everything important to him written on the lower side of his fushion cannon to serve as constant reminder why is he fighting.
Tarn's favourite animal from earth would probably be sharks because those are second favourite to his little sis after dinosaurs (yes I'll count dinosaurs as animals these ppl are old)
Tarn sometimes has realistic dreams where his sister is alive and gets extremely depressed in the morning after remembering they are no longer there. (I'm sorry for making this sad)
He has extremely good hearing like he can hear someone's heartbeat through the walls, he's freaking terrifying.
He has like 3 Blahajes (the IKEA sharks) on his bed and loves just chilling w plushies.
Despite his rough nature he's really gentle so much as that he treats the pet more like a cat than a dog, you know how there is difference how people pet their pets and some do little *pat pat* with the palm of their hands while others gently pat using fingers, ye he's more for that little scratches behind cats ears type of pat guy.
If djd ever visited earth they for sure found a stray kitten and didn't want to leave the planet because of it.
(Okay this is quite long I'll leave the rest for next chapter)

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TRANSFORMERS HEADCANONS
Fanfictionwill take requests these are mostly headcanons and one shots idk everything else will be turned into their own books