Ougon Musou Kyoku X has you swap between two characters in tag-team battles. In the game, this system is called a “Touch”. You can perform different kinds of Touches, like normal Touches, Attack Touches (switch during an attack), Guard Touches and so on. Depending on how a Touch is used, they deplete your Touch Gauge.
This is true for every character but Lucifer, whose unique ability — each character has one — is to be able to use an Attack Touch a single time, even if her Touch Gauge isn’t full. If it is full, she’ll be able to use an Attack Touch once without depleting it.
You can watch a quick rundown of some of Lucifer’s combos above. She also has a teleportation technique called “Magic Circle,” which you can see in the video above. And in case you missed it, here’s a similar video for Battler from last week.