Bone orientation

Hi, To add an information to the post I put, I imported another new character (a girl character), which has the same skeleton as this male character in the picture. I see there are some new bones created, while the new character is imported.

I am not sure, if deleting these bones will cause any issue. Can anyone please advice. I am not a rigger myself, so not sure, if this could resolve the issue, or could cause more issue. Because there are lot of animations done with this male character already. I do not want end up in redo-ing everything again.

I appreciate your help

Regards,