Who Are The Original Secret Class Characters In The Series?

For a shorter take from someone who just adores the lore: the “original secret classes” people refer to in the 'Fate' mythos are basically the extra slots beyond the classic seven — Ruler, Avenger, Alter Ego, Moon Cancer, Foreigner, and Beast. Each one corresponds to a narrative need: judges, avengers born of hatred, fragmented personae, mad AI-like presences, contactees of the unknown, and calamity-level entities. I love that these classes let writers and creators play fast and loose with who a Servant can be; it’s why I often return to 'Fate/Extra' and 'Fate/Grand Order' timelines to see the weird ones show up. They make the whole world feel bigger and a lot more unpredictable, which keeps me hooked.

I get a little giddy talking about secret classes because they spice up the whole Servant roster, and for me the most natural place to start is the 'Fate' family of stories. In that shared universe, “secret” or “extra” classes aren’t part of the original seven (Saber, Archer, Lancer, Rider, Caster, Assassin, Berserker) — they were added later to reflect weird mythic cases and narrative needs. The classes people usually label as the original “secret” ones are Ruler, Avenger, Alter Ego, Moon Cancer, Foreigner, and the various forms of Beast. Each one has a canonical early representative that fans point to: Ruler shows up memorably in 'Fate/Apocrypha' and is used to arbitrate Holy Grail Wars; Avenger is tied to tragic embodiments like Angra Mainyu who show up in spinoffs; Moon Cancer was introduced with the BB character in 'Fate/Extra CCC'; Alter Ego concepts popped up across spin-offs and mobile events before becoming regularized; Foreigner arrives later as an explicit class in 'Fate/Grand Order' with notable cases like the cosmic-tinged servants; and Beast is the catch-all for incomprehensible, catastrophic entities in the mythos.

If you want the clean list: Ruler, Avenger, Alter Ego, Moon Cancer, Foreigner, and Beast are the ones usually treated as “secret/extra” in the early expansion of the franchise. What I love about this is how each class shifts what a Servant is allowed to be narratively — one can be a judge, another an embodiment of resentment, another a glitchy mirror of a hero’s psyche. It makes replaying or rereading stuff like 'Fate/Extra' and 'Fate/Grand Order' feel like discovering new rules as you go, which keeps the mythos endlessly fun to dissect.

I’ll be blunt: the term “secret class characters” tends to mean different things depending on whether you’re thinking mechanically or story-wise, but the first wave of hidden classes in the 'Fate' continuum hooked me fast. The hidden classes originally filled gaps — think referees and cosmic weirdos — so the ones that crop up earliest and most often in discussions are Ruler, Avenger, Moon Cancer, Alter Ego, Foreigner, and Beast. Ruler functions as a neutral arbiter (there are a few memorable Rulers across the timelines), while Avenger is the class for beings born from massive resentment or spiritual corruption. Moon Cancer is specifically oddball: it’s tied to the BB phenomenon from 'Fate/Extra CCC' and has gameplay quirks and lore implications that made players talk for weeks.

Alter Ego and Foreigner are both “hybrid/outsider” categories — Alter Ego for fragments and layered personalities, Foreigner for contact with otherworldly, Lovecraftian entities — and Beast is the franchise’s way to name the monstrous, reality-defying antagonists. If you’re tracking the evolution of the series, the arrival of these classes marks the move from straight-up heroic summons to a sandbox where mythology, cosmic horror, and metafictional hacks all get invited to the party. I still find myself drawn more to the weird, borderline-impossible servants than the textbook heroes, so those secret classes are my comfort zone.