bbpress does not have fixed separators – it has default ones.
you can change simply by putting this in your child theme functions file or using code snippets plugin
function custom_bbp_sub_forum_list() {
$args['separator'] = 'whatever you want' ;
return $args;
}
add_filter('bbp_after_list_forums_parse_args', 'custom_bbp_sub_forum_list' );
You also seem to be confused by templates. Theme and plugin templates are exactly that and designed to be changed if wanted. With bbpress you simply follow
Step by step guide to setting up a bbPress forum – part 3
