Riddle Rosehearts/Relationships

Ace Trappola

 * From the same hometown

Deuce Spade

 * From the same hometown

Sebek Zigvolt

 * In Equestrian club together

Floyd Leech

 * It's shown in episode 2-11 and side stories that Riddle really does not like Floyd, mostly for his relentless teasing.

Silver

 * In Equestrian club together

Trey Clover

 * Riddle's childhood friend
 * From the same hometown

Alchemi Alchemevich Pinka (Che'nya)

 * Riddle's childhood friend
 * From the same hometown