For future reference, here's the list of characters already used in the stories so far, with brief descriptions.

Spoiles ahead.

Stallion 6:
-Prince Blueblood: Element of Magic, son of Duke Blueblood and unnamed mother, grandson of Tzar Blueblood, nephew of Celestia and Luna, has two younger brothers. Used to be a jerk, but grew out of it with power of friendship! Potentially a very talented mage, so far knows only cantrips, simple spells and teleportation. Lives in Golden Oaks Library in Ponyville with his best friend, Shining Armor. Friends call him "Blue". Special talent: unknown, something to do with maps.
-Shining Armor: Element of Loyalty, son of Twilight Velvet and Night Light, overprotective older brother of Twilight Sparkle. Uncharacteristically strong for a unicorn, but very weak at magic, aside from barriers of different kinds. Oblivious to being lusted over by many mares (and stallions). Not smart, but dependable. Suspended from his duty as a Royal Guard and serves as assistant and bodyguard to Prince Blueblood. Friends call him "Shiny". Special talent: protecting, especially with magical barriers.
-Soarin: Element of Laughter, parents unnamed, no siblings. Best friend of Spitfire, also crazy in love with her. Playcolt extreme, can seduce anything on legs, unless its ginger haired. Once a Wonderbolt, now matchmaker non-pareil. Lives with Flitter and Cloud Chaser, latter is also his gay best friend and secretary. His life goal is to make everypony happy and doesn't take failures lightly. Special talent: cutie mark implies flying, experiance says matchmaking. Its complicated.
-Big Macintosh: Element of Kindness, parents deceased and unnamed, lives with two younger sisters and granmother, his extended family reaches out through entire Equestria. Doesnt talk much and spends most of his time working on farm, unless he's traveling who knows where. Has super strenght enough to pin down a manticore with bare hooves. Special talent: apples, probably.
-Thunderlane: Element of Honesty. Parents deceased and unnamed, legal guardian of his little brother, on and off coltfriend of Blossomforth (Its complicated). Has a temper which he struggles to keep in check, but its not easy when dealing with Blossomforth and Rainbow Dash on daily basis. Works as a second in command of Ponyvilles weather patrol, but does most of the work because Rainbow Dash. Special talent: working with thunderclouds, up to including weaponizing them.
-Doctor: Element of Generosity, family unknown. Lives with Ditzy Do and seems to have quite a long shared history with her. Status of their relationship can be summed up as "complicated". Not much is known about Doctor, but he seems to know a lot, doesnt sleep and is older than he looks. Its implied he's from future, but he's been known to talk crazy from time to time, so its not set in stone. Loves butter. Special talent: time?

Three Maresketeers:
-Twilight Sparkle: Little sister of Shining Armor, may or may not have a brother complex. Top student of Princess Celestias Acadamy for Gifted Unicorns and Princess Celestia's prized pupil. Lives in dorms with her two best friends, Sunset Shimmer and Moondancer. Known to overreact a bit when panicking. Special talen: min-maxer magic.
-Sunset Shimmer: Parentage unknown, claims to be from south, where her original accent came from (thankfullly, she lost it). Second best student in academy and fierce rival of Twilight Sparkle. May or may not be evil to the core. Cares for her friendship with Twilight Sparkle and Moondancer, even if she cant explain it. Very snarky. Immune to Shining Armor's mare magnet. Special talent: uhm...
-Moondancer: Comes from noble family, parents unnamed. A student of the academy, somewhere in top 10. Dangerously high libido. Has a crush on Shining Armor. Best friend of Twilight and Sunset, but often neglected. Has a gay best friend, Silver Sword. Doesn't treat life too seriously and acts silly, but is smarter than she seems. Idolizes Princess Luna. Special talent: Night life, probably.
-Spike: Baby dragon. He exists.

Canterlots Royal Guards
-Blitz Shield: One-eyed pegasus Captain of the royal Guards, married, has a little daughter. Approaches retirement and tries to groom Shining Armor into becoming his successor, with mixed results. Complete and utter badass with heart of gold. Special talent: protecting Equestria on a strategic level. OC.
-Silver Sword: Unicorn rookie guard, always paired with Fire Strike, his best friend. Gay best friend of Moondancer, hopelessly crushing over Shining Armor. Likes hoof blades. Probably a ninja. Special talent: swords and stealth. OC.
-Fire Strike: Unicorn rookie guard, always paired with Silver Sword, his best friend, constantly teased by him. Rival of Shining Armor. Doesnt take crap from anypony, has a fiery temper but is very good at his job. Special talent: fire magic. OC.
-Crystal Hammer: Unicorn rookie guard, rival of Shining Armor. Supposedly smart, but made a stupid mistake of insulting Shiny's sister. Hasn't been heard from since. Special talent: hammers and breaking stuff, probably. OC.

Royalty and Nobility
-Princess Celestia: Alicorn, Ruler of Equestria, Goddess of Sun (doesnt like to be called that), sister of Luna. Other than running the kingdom, she enjoys running Academy for Gifted Unicorns, where she lets her students learn by experiance, more than book studies. After death of his parents, became a legal guardian of Prince Blueblood, who she treats like a son. Special talent: moving the sun.
-Princess Luna: Alicorn, Co-Ruler of Equestria, Goddess of Moon (doesnt like to be called that), sister of Celestia. Thousand years ago turned into Nightmare Moon and had to be banished to the moon, after coming back she tried to rule Equestria, but was stopped by Elements of Harmony. Now, humbled and shamed, struggles to find herself in the world again. Special talent: moving the moon.
-Tzar Blueblood: Head of the Blueblood clan, father of Duke Blueblood, legal guardian of his two youngest grandsons. Doesnt like Prince and treats him like a failure. Special talent: unknown. OC.
-Duke Blueblood: Son of Tzar Blueblood, father of Prince and two other. A decent pony, had a knack for business and administration. Special talent: unknown. Deceased. OC.
-Prince's Mother: So far unnamed, wife of Duke Blueblood. Not much else is known. Deceased. OC.

Ponyville Misc
whelp, this will take a while...

Weather Patrol, Ponyville Branch
Not now

Apple Family
soon

Horsetown
-Sunny Rays: Earth pony, fiancee of <unnamed>. A businessmare specializing in startups, helped Soarin get his business set up after he helped her with her relationship problems. Cheerful and proffessional at the same time. Special talent: startups. OC.
-Unnamed Fiance of Sunny Rays: Doesnt cheat on his fiancee. Not much else is known. OC.
-Poindexter: A nerdy earth pony, friend of Hemp Leaf and Bulk Biceps, one of Soarin's first clients and good friend. Obsesses over a franchise for little fillies. Special talent: unknown, something tech related.
-Hemp Leaf: A stoner earth pony with dreadlocks, like totally radical dude, man. Not much is known, he's famous for being "the best after-part planner", but not popular with mares. Special talent: questionable. OC.
Bulk Biceps: A monstrosity that apparently is a pegasus. Friend of Poindexter and Hemp Leaf and fellow hunter. Runs a gym called "Not-So-Dead-Horse". Has little luck with ladies. Special talent: lifting weights.

Wonderbolts
keep walking

Everfree Forrest
eventually

Other
come back later