Queen of Hearts/Succubus in Wonderland

The Queen of Hearts (ハートの女王 Hāto no joō) is a boss and potential companion in Succubus in Wonderland.

Profile
''The Queen who rules this region, and mother to Lewis and Carroll. Her power greatly increases during Hearts Day every few years, and she is unrivaled even in this world of succubi. She was adored by her people for having a gentle personality, despite being a great succubus.''

Strategy
The Queen of Hearts begins the battle with two unique buffs that quintuple her defensive stats (Diamonds Protection) and allow her to regenerate 3000 Vigor a turn (Hearts Protection), and gives your party two unique debuffs that reduce your offensive stats to 0 (Spades Intimidation) and quintuple the costs of your skills (Clubs Shackles). For the first few turns, there is no point in attacking her (your attacks will only do 1 damage, which will be undone by her regeneration) and you should focus on defending yourself. On the fifth turn, Carroll will talk to the Queen, removing Clubs Shackles from your party. Lewis does the same on the sixth turn, removing Diamonds Protection from the Queen. On the seventh turn, the Queen gives Reto a choice: you can continue to fight her (removing Spades Intimidation from the party) or you can stop (leading to an instant defeat). On the eight turn, both Lewis and Carroll talk, removing Hearts Protection from the Queen. After this point you should begin attacking.

The Queen of Hearts is weak to Pussy attacks, and her Hearts suit makes her vulnerable to Spades succubi (e.g. Carroll).

Additionally, the Queen's attacks seem to have a higher chance of being followed by quick-time events than attacks from other enemies, so be ready for these.

Recruitment
To recruit the Queen of Hearts, you must first view either of her additional scenes (see below for more details). You can then talk to her again for the option of recruiting her. Note that this is only possible in versions 2.00 and later of the game.

As a companion
The Queen of Hearts has the rank King of Hearts (♥ K). When recruited, she is level 30, has 5018 Vigor and 1914 Stamina, is equipped with the unique armor Queen's Outfit, and knows all level 3 Mouth and Hand skills, as well as the skills Wait, Breast Press Lv3, Scissoring, Scissoring+ and Resist.

Overall, the Queen has extremely high stats except for C-ranked Luck and E-ranked Growth. The latter means she levels up slowly, but because she starts at a high level and knows many skills, she also has less need to level up in order to be useful. Her trait is also very good, making her immune to instant death attacks (meaning she takes 1 damage from them) and less likely to receive the Ecstasy and Sensitivity status ailments.

H-scenes
The Queen of Hearts has the standard set of H-scenes: one for losing to her the first time, one for subsequent losses, and one for her level drain. These have her give Reto a titjob.

In versions 2.00 and later, the Queen of Hearts has two additional H-scenes. To access these scenes, you need to reach the 2.00 stage of the game (which requires defeating the Queen and White Rabbit, and recruiting Alice), and you also need to obtain the Mysterious Crystal key item (found on the table in Lilith's house in Mel Village, after recruiting Lilith). Talk to the Queen again (she can be found on 7F of Mysterious Castle), give her the Mysterious Crystal, and choose the options that lead to the H-scenes. The set of options allow you to pick which scene you want: one has Reto shrunken to a child, while the other has him in his normal form.