Change my and friends profile data example: change profile image

functions.php

<?php
/**
 * Update my profile data before get BUC chat
 *
 * @param array $profile Get my profile data.
 * @return array
 */
function buc_update_my_profile_data( $profile ) {
	// If set custom profile image.
	$custom_image = 'http://demo.wpvenus.com/bp-better-user-chat/wp-content/uploads/2020/06/Venus.png'; // Custom image url.
	$profile['avatar_url'] = $custom_image;
	return $profile;
}
add_filter( 'buc_before_get_my_profile', 'buc_update_my_profile_data', 10, 1 );

/**
 * Update friends profile data before get BUC chat
 *
 * @param array $profile Get friends profile data.
 * @return array
 */
function buc_update_friend_profile_data( $profile ) {
	// If set custom profile image.
	$custom_image = 'http://demo.wpvenus.com/bp-better-user-chat/wp-content/uploads/2020/06/Venus.png'; // Custom image url.
	$profile['avatar_url'] = $custom_image;
	return $profile;
}
add_filter( 'buc_before_get_friends_profile', 'buc_update_friend_profile_data', 10, 1 );