Have you ever become friends with someone who used to be your enemy?

Yeah. My classmate. She used to being sarcastic to me for being loud and chaotic in class. First day at school, 9th Grade, we came earlier than the rest.
She forgot her pencil case and I lend my pen to her. Then, we decided to sit together and become lab partner. We both have a lot chemistry despite the fact we came from different background.

Both of us lefthanded. We have no problem writing on the desks.

We also loves chess club.

We both anti social.

Only after subjugating them to my standards.

I became best friends with my late best friend after I stood up to him after he pointed a sawn off shotty at my face. He was shocked at my bravery. Then we became best mates like twin brothers pretty much, until he died the following year.

Not friends as such, but less emnity certainly

Yes, but he changed.