Well my fellow assassin it is now time to meet the important people you get to meet throughout all of the games.
From the Ancient Era of Greece and Egypt to the British Industrail Revolution and all the unique charcters within the games Odyssey to Syndicate

Assassin's Creed Odyssey Characters: Nikolaos and Myrrine the parents of your charcter while you grew up before being tossed off the cliff and Myrrine is a descendant of Leonidas.
Elpenor a wealthy person who pays your charcter to assassinate a few people like your now discovered stepdad and mother.
Pythagros who turns out to be your real father.

Assassin's Creed Origins Characters: Khemu your son in origins
Aya your wife in assassins creed orgins
Cleopatra queen/pharoh of eygpt when your charcter is helping your wife.
Julies Ceaser Roman Dictator who falls in love with Cleopatra and ends up getting stabbed 23 times.

Assassin's Creed(The original first game)Characters:
Tamir, an arms merchant selling weapons to both sides.
Garnier de Nablus, a prominent Crusader conducting alchemical experiments on the sick.
Talal, the leader of a gang of slavers.
Abu'l Nuquod, a pompous trader stealing money meant to fund the war.
William V, Marquess of Montferrat, the cruel and abusive regent of Acre.
Majd Addin (based off Baha ad-Din ibn Shaddad), a tyrant who rules Jerusalem through fear.
Master Sibrand, a paranoid knight planning to betray the Crusaders.
Jubair al Hakim, a scholar using his position to seize and destroy all written knowledge.
Robert de Sablé, the grandmaster of the Templars, the ancient enemies of the Brotherhood.
Your Master and mentor Al Mualim

Assassin's Creed II Charcters:
Leonardo Da Vinci self explainitory
Pope Alexander VI, who is the main enemy of the game which is the person who caused your families death.
Minerva, Precursor Sentient who gives a message to your character at the end of the game.

Assassin's Creed Brotherhood Characters:
Leonardo Da Vinci self explainitory
Pope Alexander VI, who is the main enemy of the game which is the person who caused your families death.
Cesare Borgia, son of Pope Alexander VI who wont stay dead after the many times you assassinate him.
Juno, another precusor sentient who takes over Desmond in the colosseo in Rome.

Assassin's Creed Revalations Characters:
Your Master and mentor Al Mualim
Subject 16, Who was kidnapped by abstrigo industries before Desmond who is now stuck in the animus
Altaïr Ibn-La'Ahad, The original assassin who's memories you go through to find keys to his library where you discover another piece of eden

Assassin's Creed IV Black Flag Characters:
BlackBeard, The infamous pirate king and captain of the most feared pirate ship in the seven seas The Queen Annes Revenge
Sage named Bartholomew Roberts, Who is basically Juno's Husband reincarnated so many times including modern day
Mary Read, Your character's love interest throughout the game who dies after giving birth.

Assassin's Creed III Characters:
Haythem Kenway, Your Characters father and grand master of the templar order in america during the war of independence.
Benjamin Franklin, One of the founding fathers and an inventor who helps your character throughout the game itself.
George Washington, Famous general during the war of independence who is in several battles with your character theoughout the game.
Charles Lee, The last of the templars that you have to chase down before finally assassinating him in a bar after a long chase sequence.

Assassin's Creed Rogue Characters:
Achilles Davenport. An elderly man and the last surviving member of the American assassins and who teaches your character the ways of the assassins before your character betrays them.
Haythem Kenway, The grand master of the templar order in america during the war of independence who gives your character the induction to the templar order.
Arno Dorian. Arno Victor Dorian is the French-Austrian assassin and protagonist in Assassin's Creed Unity.

Assassin's Creed Unity Characters:
Élise de la Serre, Your characters love interest who is also a templar but works close to your character till the end of the game till her unfortunate death.
Napoleon Bonaparte, Well we all know about Napolean except in the game he is somewhat helpful but really just shows off his military power.
François-Thomas Germain, The main templar grand master who kills your characters love interest with the sword of eden.

Assassin's Creed Syndicate Characters:
Crawford Starrick, Templar grandmaster who takes control of london by terror and alongside his fellow templars.
Alexander Graham Bell, a scientist and inventor who would be able to repair the rope launcher.
Charles Darwin, Greatest scientist and thinker of the time and discovered the theory of evolution.
Queen Victoria, Though she doesn't play a huge part in the story till near the end she does pardon the assassins for being in buckingham palace during the queens ball where they had assassinated the templar grand master who had the shroud(another precusor object that restores all wounds and makes the person basically invincible.).