To explain all of their horses more:
Senshi rides a Shire named Anne. She’s very skiddish and unreliable but loves senshi and likes to chew on his beard. He found her on the open plains all alone as a foal and has been raising her ever since.
Chilchuck rides a Shetland Pony named Daisybelle. She’s the most evil pony in existence and her soul purpose in life is to nip and bite everything in front of her. She was originally his daughter’s but he had to borrow her when he lost his previous horse. He tries to braid her hair the best he can but she makes it very difficult.
Marcille rides a Mule named Ambrosia. She raised it during her school years and it’s starting to show its age. Without spoilers for the series, let’s just say she feels a deep connection to Ambrosia for being different.
Laios rides a Wild Painted Horse named Horsey. After Falin was kidnapped, he was left without a horse and little money to buy a new one. So, Laios being the freak he is goes out into the countryside and somehow managed to wrangle a wild one. Horsey’s still unresponsive a lot of the time but surprisingly hard to spook.
Izutsumi doesn’t have a horse and instead rides on the back of one of the other’s.