I agree on Prime Arcee, she's not a hot waifu, but a warrior that went through shit, witnessing 2 of her partners get brutally murdered, watching Cybertron fall, seeing many 'con experiments during the war and many other things, so making her a body pillow is just disrespectful.
of all the "waifus" of Transformers if we can call her that My favorite would be Stardrive, I think it's very underrated By the way is not the one that appears at the end?
I guess Solus, she deserves to be fucked for making the Star saber out of shit, being not able to defeat Megatron's home-made dark-en sword, who isn't even a Prime, he just "borrowed" one's hand, it almost got Optimus the freakin' Prime killed.