You can answer in the way you like to do.

Sometimes, I respond:

• All good, thanks. And you? / what about you?
• Fine, and you?
• Fine, thanks.

In your case, since you usually sa "hi" or "hello", yuo can add the following:

• Oh, hi, how are you?
• Hello there I think I read this response from a PSX videogame calle Yu-Gi-Oh! Forbidden Memories :)

You can answer in the way you like to do.

Sometimes, I respond:

• All good, thanks. And you? / what about you?
• Fine, and you?
• Fine, thanks.

In your case, since you usually say "hi" or "hello", you can add:

• Oh, hi, how are you?
• Hello there I think I read this response from a PSX videogame calle Yu-Gi-Oh! Forbidden Memories :)