Richa (boss)

Having fallen in despair and threatened to death by the Archia Think Tank, Richaryosha wasn't able to listen to Hikari Gojo's words and began singing EXEC_Z/., which aside of finally executing the Human Evolution Project, it would also mean the end for most Reyvateils and most of humankind. That's the reason you will be fighting against her.

As it befits her title of former Clustanian Supreme Commander, Richa is speedy and strong, and will always make her priority targeting your Reyvateil, so unless you manage to stall her yourself or with the other Vanguards, you will have to depend on the Blowback to keep her away. Similarly, her Stored Attack Flower Bird Wind Moon will cause large physical damage to a single target, most likely killing off the attacked character, so be always ready to revive them. Richa also has formidable resistances against all elements, average physical and Song resistance, is immune to all status ailments, and she is capable of inflicting them on the Vanguards that get hit by her attacks. However, she also has a relatively low defense, so once you have managed to reach a decent amount of Burst, you can just use Song Magic to destroy the robots accompanying her and then surround Richa herself with your Vanguards, which will greatly simplify the battle. Once there, you can opt to continue hitting her with physicals, or speed up things and finish her off with Ultra Supermoves or a Flipsphere.

Trivia
The name of her Stored Attack is actually a four-kanji compound that translates roughly to "The Beauties of Nature". All of the involved kanji also appear during the attack's execution.