I'm having more brainworms for the "Tarn and Rodimus are brothers" AU.
Like Rodimus having this dead look in his eyes. Like he comes off as very cheerful and happy, a jokester, maybe kind of guided by his ego but no one can, expect Drift but even he sometimes has to look away, look him in his optics because they look so dead and lifeless.
His optics so dead and lifeless because he never got a chance to mourn his "dead" brother, the trauma of the war and suddenly becoming a prime.
Maybe Tarn has much more warmer or like kinder looking optics, maybe because he could still hear Rodimus' thoughts and in a way that help ground him, help him stay sane while he commit horrid acts in Megatron's name and the Decepticon cause.
Maybe his kinder eyes make it easier for people to look at him, make it easier for him to kill people, because why wouldn't you trust the mech with the warm, gentle, maybe soft red optics who smiles so sweetly and voice is like honey, maybe how he kills you will be much quicker and merciful. Almost like a siren's song he abuses.
