After Blake demands Ragna's Keystone, Ruby challenges him and Gordeau to fight. Ruby introduces herself and Blake to Ragna and Gordeau the Harvester and becomes excited to see their weapons. In Chapter 2, Ruby Rose and Blake Belladonna attempt to ambush Ragna the Bloodedge to steal his Keystone but fail. Additionally, the two Persona 4: Arena androids, Aegis and Labrys, have the color scheme of the robotic Penny and are paired with a Persona colored like Ruby to reflect how the two became friends.Ruby makes a brief cameo when the System XX begins observing and searching potential catalyst samples from all four different worlds. For example, Yu Narukami's RWBY-themed color palette features Yu with Ruby's color scheme and his Persona with Weiss' color scheme. The RWBY-themed color palettes for the Investigation Team of Persona 4 reference the partnerships that were formed between the members of Teams RWBY and JNPR during the Beacon Academy Initiation.Grimm color palette: Susanoo ( BlazBlue), Magatsu-Izanagi ( Persona 4 Arena Ultimax), Merkava ( Under Night In-Birth).Adam Taurus color palette: Hazama ( BlazBlue), Waldstein ( Under Night In-Birth).Neopolitan color palette: Rachel Alucard ( BlazBlue), Elizabeth ( Persona 4 Arena), and Seth ( Under Night In-Birth).Roman Torchwick color palette: Teddie, Tohru Adachi, Thanatos ( Persona 4 Arena/ Ultimax), and Carmine ( Under Night In-Birth), Neopolitan ( RWBY).Cinder Fall color palette: Nine the Phantom ( BlazBlue).Salem color palette: Hilda ( Under Night In-Birth).Ozpin color palette: Jubei ( BlazBlue).Ciel Soleil color palette: Ex Machina: Minerva ( BlazBlue).Mercury ( BlazBlue), Aegis, Labrys ( Persona 4 Arena), Vatista ( Under Night In-Birth). Penny Polendina color palette: Nu-13, Celica A.Raven Branwen color palette: Yang Xiao Long ( RWBY).Summer Rose color palette: Ruby Rose ( RWBY).Neptune Vasilias color palette: Akatsuki ( Akatsuki En-Eins).Sun Wukong color palette: Naoto Kurogane ( BlazBlue), and Gordeau ( Under Night In-Birth).Lie Ren color palette: Noel Vermillion ( BlazBlue), Mitsuru Kirijo, Caesar ( Persona 4 Arena), Yuzuriha ( Under Night In-Birth), Blake Belladonna ( RWBY).Nora Valkyrie color palette: Makoto Nanaya ( BlazBlue), Akihiko Sanada, Artemisia ( Persona 4 Arena), Yang Xiao Long ( RWBY).Pyrrha Nikos color palette: Platinum the Trinity ( BlazBlue), Naoto Shirogane, Take-Mikazuchi ( Persona 4 Arena), Weiss Schnee ( RWBY).Jaune Arc color palette: Mai Natsume ( BlazBlue), Kanji Tatsumi, Sukuna-Hikona ( Persona 4 Arena), Ruby Rose ( RWBY).Yang Xiao Long color palette: Azrael, Iron Tager ( BlazBlue), Yukiko Amagi, Tomoe ( Persona 4 Arena), Mika ( Under Night In-Birth).Blake Belladonna color palette: Hakumen ( BlazBlue), Chie Satonaka, Konohana Sakuya ( Persona 4 Arena), Linne ( Under Night In-Birth).Weiss Schnee color palette: Jin Kisaragi, Izayoi ( BlazBlue), Yosuke Hanamura, Izanagi ( Persona 4 Arena), Orie ( Under Night In-Birth), Yumi ( Senran Kagura).Ruby Rose color palette: Ragna, Es ( BlazBlue), Yu Narukami, Jiraya, Ariadne, Pallas Athena ( Persona 4 Arena), Hyde ( Under Night In-Birth), Heart Aino ( Arcana Heart).