Protagonist

Dan

Rosa

"Education? You mean brainwashing!"

There's two playable Protagonists in Adventure High: Dan and Rosa (though always refered to as The Protagonist on this wiki with a handful of exceptions, such as dates that requires you to play as either Dan or Rosa).

The Protagonist is a childhood friend of Valerie, or Val for short.

The Protagonist has as of version 0.38 thirteen spells, of which one is Hidden.

Sarah is only datable if you're playing as Dan (unless you charm her as Rosa).

Rosa currently has no female-exclusive relationships but will have one with Cassandra in the future (though you will be able to charm her or make her your pet as Dan).

While a normally calm person, it's up to the player to decide how the Protagonist is in the end: Either a caring person who wants to stop Drape from abusing his power to change school to his fitting, or enslave everyone in the school. Or, hell, cause everyone to turn into bimbos.

The Protagonist lacks any damaging spells initially and as such relies on his/her teammates to deal damage, or (as unlocked later) the Confuse spell to make enemies hurt themselves.

The Protagonist can naturally not use any magic and is as such considered "giftless". It's unknown as to why - or how - this happens for certain people.

There's a handful of scenes that requires the player to play as either Dan or Rosa. However, in general, this mostly just affects minor story details. With a few exceptions.

Background

The Protagonist grew up in a somewhat poor home - apparently unable to afford a Crystalizer to obtain Gems, which is described to be quite expensive up front, but pays themselves off quite quickly. Instead, the Protagonist is given Molly's old one, something the Protagonist is grateful for. She admits to having no issue with being able to purchase a new one anyway.

The Protagonist's father is away on an extended trip and as such isn't likely to return before the end of the school year. After reaching the seventh floor in the Dungeon, the Protagonist will find a note from his/her mother, saying she managed to get a job with her husband as they needed the extra money.

To make sure the Protagonist wouldn't go hungry, she made him/her casserole - apparently enough to scare the Protagonist enough to wonder if s/he'll be able to finish it all before it goes bad.

As a child, the Protagonist apparently quite often hung out with Val. As a result, as they grew up, Val grew to fall in love with the Protagonist - something the Protagonist is apparently completely unaware about.

Seeing Val as nothing more than a childhood friend (or a possible love interest or slave), the Protagonist has no issue with discussing anything on his/her mind with Val, though Val's short temper - and slight obsession - towards the Protagonist often leaves the Protagonist dumbfounded at Val's behavior.

Trivia

The Protagonist starts with 100 HP and Stamina.
The Protagonist is the first character able to use all four kinds of spells.
If you choose to tag with Molly during the Bimbo World New Game +, the Protagonist won't obtain magic from the Sigil. Instead, Val has to give it to the Protagonist in secret.
If you choose to tag with Julia during the Mysterious Book New Game +, the Protagonist won't obtain magic from the Sigil. Instead, Val has to give to the Protagonist in secret. Julia, however, remarks that she was aware of his lack of magic but thought she was incorrect about it. Julia is then surprised at the fact that the Protagonist's gift - as well as Val's gift - changed.
Despite remarking that the school has no dress code, the Protagonist, Derrick and Cassandra all dress quite formal compared to everyone else, who - supposedly - wears clothes they find comfortable or otherwise like.
The Protagonist is most likely a year older than everyone else, as the Protagonist was one day too young to enroll in the school but still a year younger than Ashley, as she's described as being a year older than the Protagonist is.
This is further evidenced by Molly's Japanese School Girl outfit, in which she refers to the Protagonist as "Senpai" (meaning "senior"). However, that could possibly just be for appeal.