I've been passing the time by thinking of a Shantae & Mario themed RPG... and it's occurred to me that the five Shantae games are comparable to the five Mario & Luigi titles in interesting ways.
- The original Shantae & Superstar Saga obviously both served to introduce their series and conventions.
- Risky's Revenge & Partners in Time are sequels that struggle to live up to their predecessors and successors, both being undercooked in some ways.
- Pirate's Curse & Bowser's Inside Story are both often seen as the pinnacle of their series, despite their drastic shake-up in mechanics (Gear in the former, Bowser for the latter)
The two latest games muddy things up a bit...
- Half-Genie Hero is actually closer to Paper Jam. They both arguably push their traditional gameplay mechanics to their limits, but also have rather formulaic plots compared to the standards raised by other games. The former even has a bit of that crossover vibe going with Officer mode.
- Seven Sirens & Dream Team have similar settings of island resorts with hidden secrets, and see the protagonist empowered in unique ways.