BuddyPress.org

There are several filter hooks you could try.
Look towards the bottom of function bp_core_fetch_avatar in this file:
wp-content\plugins\buddypress\bp-core\bp-core-avatars.php

For example, I would try this one first:

function gabriel_random_avatar( $default_grav, $params ) {

     // $default_grav is an url
     // replace it with the full url to one of your preferred avatars

     return $default_grav;
}
add_filter('bp_core_avatar_default', 'gabriel_random_avatar', 99, 2 );

Don’t use the filter.
Overload this template:
...wp-content\plugins\buddypress\bp-templates\bp-nouveau\buddypress\members\single\home.php

And then replace <?php bp_nouveau_member_header_template_part(); ?>
with a call to the image you want to use.

I have deleted the WordPress accounts…

You mean you deleted those users?
BuddyPress users are the same as WP users.
So if you delete a user, they won’t appear anywhere on your site.

This works great and new image shows – BUT – when I turn off Settings > Buddypress > Disable Cover Image Uploads – no image at all is shown! How do I show the new image AND disable Cover Image uploads? Thanks 🙂

function bp_custom_filter_cover_image() {
return ‘https://i.ytimg.com/vi/tntOCGkgt98/maxresdefault.jpg’;
}
add_filter( ‘bp_attachments_pre_get_attachment’, ‘bp_custom_filter_cover_image’ );

I’m also looking to include buddypress activity in site search, so bump!

yes you can you can find details here

Template Hierarchy

Please add the ability to put your answers to my posts, click on the button (like), so that (and other users) can see the notification “Someone liked your post.” I also have one question.
1. I cannot complete user registration if I fill in the Name field in Russian (Пользователь). If I write the username in English (User) then everything works fine. https://prnt.sc/13bx92f
The support of the Russian language is important to me for my work. I continue testing BuddyPress. I like it, I think I will learn how to work with your plugin, you just need to understand some subtleties.

@drducky check screen options at top right
after clicking on it on it will have checkbox for BuddyPress

BuddyPress Links in WordPress Menus