- Cross-Dressing Voices: Goku, Luffy & Luckyman, Naruto, Kenshin* , Baby Beel, Taro, Tsuna* , Reborn* , Gon and Killua.
- Marth Debuted in "Smash Bros.": The localization of this game brought along with it several characters whose respective series were never officially released outside Japan, such as Luckyman, Ryoutsu, and Saiki. The most egregious case was that of Tarou Yamada — a character from a series so strange and obscure that it didn't even have a page on the Other Wiki.
- Name's the Same: Aside from the sole fact that Goku's name is literally just "Wukong" said in Japanese on'yomi, Tarou's name is literally just a portion of Momotarou's with the two same characters (太郎).
- No Dub for You: The game did not receive any dubs when it was localized and released overseas, likely due to the difficulty of gathering voice actors for all the different series represented in the game.
- No Export for You: Averted! After months of silence and despite many Jump crossovers before it not getting the localization treatment, J-Stars received an English release as "J-Stars Victory VS+" in 2015 with added features.
- Relationship Voice Actor: This isn't the first time Unshou Ishizuka has voiced a character named Heihachi who was previously portrayed by the late Daisuke Gori.
- Role Reprise:
- Most, if not all of the voices for the characters are the same as the anime voices (if the character even has an anime incarnation, that is).
- Averted with Koro-sensei, who is played by Jun Fukuyama in the anime but Tomokazu Seki in the first animated adaptation (the OVA; barring his VOMIC VA Masaya Onosaka who voices Don Patch). By that proxy, it's due to the anime coming out after J-Stars.
- The same also applies to Kusuo Saiki, who while reprised by Shintarou Asanuma from both the flash series and VOMIC adaptations, has Hiroshi Kamiya voicing him in the recent anime series instead.
- Also averting this are the Hunter × Hunter characters, but the more clear case is Gon due to Junko Takeuchi to voicing him in the old anime, but is now voiced by Megumi Han instead as of 2011; this pretty much averts Talking to Himself with Naruto.
- Talking to Himself:
- Mayumi Tanaka voices Luffy and Luckyman.
- Ryotaro Okiayu voices Toriko and Nuubee.
- Masakazu Morita voices Ichigo and Seiya.
- Tomokazu Sugita voices Gintoki, Joseph, and Switch. A quiz question in the + version of the game directly references this regarding both Gintoki and Switch.
- Katsuyuki Konishi voices Oga and Kenshirou.
- Takehito Koyasu voices Neuro and Bo-bobo.
- Tessho Genda voices Younger Toguro and Raoh.
- What Could Have Been: Incomplete data for Jotaro Kujo, DIO and Dai as playable characters, and Yoh Asakura as a support character was found within the game disc's assets, suggesting they were planned at one point but Dummied Out later. The three planned playable characters were eventually Refitted for Sequel in its successor Jump Force.
Trivia / J-Stars Victory VS