The stage 3 boss, kinda ordinary magician.
Her main ability is use of magic.
She is a versatile magician, that has no specific strong or weak point in any area. If you ask me, she is similar to Marisa, or rather I'd say a youkai version of Marisa.
Alice is a collector as well, and has the habit of collecting magic items, especially magic books.
As they both share the same hobby, she often clashes with Marisa so they're kind of in a cat-and-dog relationship.
Most recently, she is interested in collecting dolls that have a story associated with them.
She had no evident reason to attack Reimu and company. They were chosen for the target of her magic because they were there. Dominating the enemy with overwhelming power is not fun at all for Alice, so she always sees her opponent's reaction and tries to fight with power that exceeds the opponent by a hair. Even if she loses, she doesn't show her full power.
That's because she thinks it would be the end of the rope for her if she lost with full power.
In this point, she is somewhat similar to Reimu.