Is there? I know this is a popular conception but it doesn't really stand up to facts. Let's look at the Japanese game chart from last week:
- [PS4] Lost Judgment
- [NSW] Dragon Ball Z: Kakarot + A New Power Awakens Set
- [PS5] Lost Judgment
- [NSW] WarioWare: Get It Together!
- [PS4] Tales of Arise
- [NSW] Minecraft
- [NSW] Ring Fit Adventure
- [NSW] Mario Kart 8 Deluxe
- [NSW] Super Smash Bros. Ultimate
- [NSW] Momotaro Dentetsu: Showa, Heisei, Reiwa mo Teiban!
- [NSW] Pokemon Sword / Shield
- [NSW] Super Mario 3D World + Bowser’s Fury
- [NSW] Animal Crossing: New Horizons
- [NSW] Clubhouse Games: 51 Worldwide Classics
- [NSW] Splatoon 2
- [NSW] Super Mario Party
- [PS4] Judgment
- [PS5] Tales of Arise
- [NSW] Game Builder Garage
- [NSW] The Legend of Zelda: Breath of the Wild
- [NSW] BanG Dream! Girls Band Party! for Nintendo Switch
- [PS5] Death Stranding Director’s Cut
- [NSW] Miitopia
- [NSW] eBaseball Pro Baseball Spirits 2021: Grand Slam
- [NSW] Dragon Quest XI S: Echoes of an Elusive Age Definitive Edition
- [NSW] Fitness Boxing 2: Rhythm & Exercise
- [NSW] Monster Hunter Rise
- [NSW] Ni no Kuni II: Revenant Kingdom – Prince’s Edition
- [NSW] New Super Mario Bros. U Deluxe
- [NSW] Super Mario Maker 2
Out of 30 there's only two games that I would say fit your description,
Momotaro Dentetsu and
BanG Dream! Girls Band Party!. There's also eBaseball Pro Baseball Spirits but as you say its usual for different regions to have different sports preferences. The vast majority of games on that list also sell decent numbers outside Japan too so I think its wrong to say "there's so many weird franchises".
Vita audience has mostly moved to Switch by now. Steam deck could still become a success in Japan with more and more Japanese developers supporting PC
Even with a global market its still interesting to discuss individual countries
Its mostly been the PS5 line up in its first year that has been an issue, but its got better recently with Tales and Lost Judgement. Once we start getting more games releasing on PS5 that will help too (a lot of Japanese developers are sticking with PS4 for now).