backstory- when optimus became a prime he was happy for his brother but...megatron wasnt an so the war started kai now known as kaisus was fighting a con when the con knocked him off balnce an he landed on a dark energon crystal after he realized what happend he tried to pull it out but it was too late it was already inside him turning his bright colors darker an his eyes a orange instead of blue he screamed in pain as he felt the darkness taking him over witch cought optimus attention when he saw his brother changing he felt his spark almost stop he knew his brother was gone it was too late to save him...*years later* his brother is now the one known as kaisus the one who u fear was his title his digits are long sharp black claws his bod is a very dark purple his teeth are now fangs his arms now have sharp ends that can cut though metal he is so much different then he was when he was kai, kai was sweet loving an cared for every ones saftey kaisus is bitter an can still love but hates to show it so he says how much he hate them instead he still cares as well but only for his fellow cons but when he looks at his brother in battle he feels tear roll down his face as he remembers how much he loved his brother but he can no longer be with his brother since he is now a monster the dark energon controling him to be evil an dangerus he cant control himself an since he laughs while out of control he still has purple tears roll down his face while he would fight with his brother soon he will gain control over the energon but for now he must train himself to fight it...
(....this sounds like he's in love with his brother XD,he's not though its just funny o made it seem like that )
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