No, he doesn't. The Tokyo Revengers manga doesn't have Takemichi's death. Instead, he plays a crucial role in the unfolding events and continues to be an important part of the story.
Well, Cid Kagenou does reveal himself at a crucial point in the manga. This reveal has significant implications for the plot and character development.
I don't have a definite answer for you. The manga might be keeping us in suspense about who Cid Kagenou will end up with. It could be a surprise twist or a character that has been hinted at throughout the series.
Takemichi's time - leaping ability in the Tokyo Revengers real story is quite unique. It doesn't seem to follow a set pattern like in some other time - travel stories. As I said before, emotions play a big role. But also, it's not something he can fully control. Sometimes it happens unexpectedly. For example, when he's in a dangerous situation and his mind is focused on going back to change things, he is suddenly transported back. This ability is what drives the whole plot as he uses it to try and make a better future for his friends and Hinata by changing the past.