I swear to Celestia, the only difference between Mayor Twinstrike and Charger is a twenty year head start.
On that topic, two more secondary level ponies:
Name: Mr. R. Walker
An earth pony stallion with a dark blue coat, black mane and single bright silver streak. He is almost always wearing some piece of headgear or another, usually a top hat, along with his suit and coattails. His cutie mark is of a top hat. Middle aged.
Fame, fashion and connections. Making Hats especially.
Mr. Walker started off his career in hats, and quickly became famous for his expert designs. His real break came when was he was invited to Canterlot, where he became something of a star. He began to shift his focus from designing new garments to critiquing existing ones, gradually shifting to become a fashion mogul.
Mr. Walker is good natured and funny, but he's subtly intimidating. He bases a lot of his business persona off a subtle mockery of figures like Hoity Toity and Photo Finish, but even though he is generally nicer than those ponies that doesn't mean he goes any easier. When writing reviews, he is merciless in a cuttingly humorous way.
Father of Charger, husband of Deep Pockets, and old school friend to Super Cereal and Caramel Creme.
Name: Mrs. Deep Pockets
A rich brown coated unicorn mare with a bottle blonde mane and little streaks of gold around her hooves. She has a gold coin cutie mark, and usually carries a white umbrella with her.
Style, glamour and a speciality in making money.
As a filly, Pockets used to be extremely athletic and rebellious. As she grew, she discovered that there was increasingly little to rebel against given how easy she found using money to solve the problem instead. Eventually, she slowed down, made a series of brilliant investment decisions, became one of the richest ponies in Equestria and entered a state of semi retirement with her husband.
While Deep Pockets is usually sedate and laid back, she has a tendency to explode when provoked. She has a serious anti-authority streak which is only mollified by being the authority in most cases. She's quick to forgive, but quick to challenge.
Mother of Charger, wife of Walker, and old school friend to Super Cereal and Caramel Creme.