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CyberWolfBia
Look, I know from your region, Alex Kidd has some significance, even in Europe in small cases but after the MS games, his popularity dropped like a rock. And then he was straight thrown away and buried after Sonic 1 came out and was a massive success.
He didn't matter for Sega for almost 2 decades until they used him for collection titles.
When it comes to non-Sonic Sega reps, NiGHTS have some sort of lead against most franchises due to him being a second popular character (Europe really loves NiGHTS and has fond joy for the Saturn, despite getting overtaken by Playstation). After that, none don't have any stay.
JSR is niche despite the love it gets, Shinobi doesn't stand out as much, Bayonetta is kinda new and is more related to Platinum (and as of now Nintendo because of the costumes and Easter eggs in the sequel), Phantasy Star was a major franchise to Sega but being stuck to one region will never help its cause and everything else is too small for itself.
Atlus itself is the only thing that'll have anyone good enough to be a number 2 rep outside of NiGHTS with Jack Frost since he can represent the MegaTen series as a whole which has a lot of popularity especially it's 2 sub series (SMT & Persona). But he's a pipedream