BuddyPress.org

@kimo130875 Theme icons are set by your theme. Submit a ticket to your theme support it seems like you are using kleo. I think, the theme does not offer any inbuilt options to change them, but you can edit them by using custom CSS.

@kimo130875 Profile icons are not part of BP itself, it should be part of your theme, in general, you can override them using custom CSS.