Basically^Johnny Novgorod said:Fanservice.
Wardrobe.
Katawa Shoujo.
Harem plots.
High school setting.
Gratuitous campy characters.
Vaguely effeminate villains.
Retarded dialogue.
Every second line of dialogue starts by repeating the first line of dialogue.
Panty shots.
Female anatomy.
Female armor.
Hyperdimension Neptunia.
Squad of Elite Strippers.
Passive-aggressive love interest.
13-stage bosses.
7 year old generals.
21 year old "veterans".
Kill God.
Save the World.
CHOTTO MATTE KUDASAI!
Also impossibly difficult, thankless games where style is championed over getting things done, and you're graded based on an average of EVERYTHING, and even though you did impeccably on combo, time and damage you get a C+ because you failed to break your controller while reacting to that one fucking QTE.
With the addition of obnoxiously loud protagonists, hyperactive with a high pitch voice side kicks, lolita, LOL MASTURBATION, "ACCIDENTALLY" GROPING SOMEONE AND RAPE, out of place "cute" scenes, the character who stands on the sidelines in fights to monologue about how everyone else is awesome and they are useless (bonus point if their big moment is dying in place of another character because they know they are dirt compared to them), long speeches before and/or after fights, lengthy stories about a characters life to sad music, retarded jiggle physics and high heels everywhere.