Of what’s been brought up Winged Hussars and eastern European Bradich axe and matchlock infantry to go with them, along with some period appropriate ottoman forces to face off against would be a good idea though I think that is sort of at the tail end of renaissance and might be considered a different period (same deal with the ECW and 30YW).
knights of Malta as a conversion sprue would be great since I think all that is really needed core wise is some wheel lock pistols and hand axes for the conquistador sets (both things fantasy gamers wanting a “you know what” army would love).
Male and female militia/townsfolk/peasant rabble sprues are actually a pretty big gap for the Middle Ages and Renaissance, and fantasy gamers could use some other options then what is available.
Condottiere and their troops for the Italian Wars, etc. are actually already fairly well covered by Perry since that’s basically what the Mercenary box and other WOR/IW sets are given that condottiere just means “mercenary captain” in Italian and was used for all sorts’ mercenary leaders. In fact the Warlord landsknecht sets also fills this roll quite well since they too have a command sprue, and they are pretty cross compatible with the Perry sets. Western European mercs for the most part looked very similar back then due to battlefield lootings (ie one of the reasons I kept telling WA they should focus on world exploits at the time and label the line “Age of Discovery” or “Age of Sail” but no😆).
India and Africa might be interesting, India in particular, of course so would a lot of South East Asia and the archipelagos near it like the Philippians and Indonesia.
Ming China and Joseon Korea are both interesting but you only really want to do those if your planning on doing 15th-16th century Japanese sets, since neither are really the most militarily interesting periods for Korea and China from an English speaking sphere perspective beyond the Imajin war (samurai invasion of Korea).
The real interesting times for China outside maybe the 18th-20th centuries are: the Warring States (already in the schedule and personally more interesting than 20th), Three Kingdoms, Mongol Invasion and Rule. The Tang and Han Dynasties are interesting due to invasions of foreign nations such as Persia, Mongolia and Korea among others, however general knowledge about those conflicts in the western world is severally lacking (i.e. not enough dubs yet to make you think "heck yeah do that!").
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For Korea the real interesting period was actually around the time of the Vikings in Europe and is know as its Three Kingdoms Period which was long and had a lot going on: rebellion against Han China at the start, constant interference from Tang China later on, Silla’s treacherous conquest of the other nations, temporary/limited Japanese invasion and later intervention, and it ends with Silla, China, and a newly formed Manchurian Kingdom being the major regional powers till the Mongol Invasions (which is the second most interesting military period for Korea followed by the 15th-16th century Imajin war Joseon and 20th century conflicts).
So while it would be an earler subject than the renaissance, outside of what they \ already have planned for China (Warring States and Boxers) it might be wiser for WA to do the Mongol Invasions/wars with a starting focus on Asia instead for Korea, Japan, and China, as it is rather significant to all them (as well as India and much of the rest of the known civilized world at that time), the European parts are already covered somewhat by Fireforge, of the non-European involved Asian conflicts they are more well known in the Anglo Sphere than the Imajin war and what’s more it gives WA an excuse to do earlier era Samurai and even things like Vietnamese as well as Chinese; Indians; Koreans; etc.
Frankly I am not sure why the Mongol Invasions are not already a heavily covered subject in plastic yet since it dwarfs every other Empire build up in history except the British Empire and “Age of Khans” would be an awesome line name.
