This didn't look right to me, so I checked: that's not a real Maya symbol, but a Mayanism one (New Age stuff), funnily enough based on an Aztec symbol. You can see the original Aztec one on page 13 of this scan of the Codex Magliabechiano: https://digicoll.lib.berkeley.edu/record/289019?v=pdf

Do you still need answers? Has there been a discussion about preferred units somewhere? Just a few things in the meantime. Regarding the great Gupta emperors, all were warriors and patrons of learning, giving them auras with combat and maybe tech speed bonuses. For their differences: -Chandra-gupta I: founder of the empire, unified territory through marriage, followed by conquest. Maybe capture bonus (since diplomacy mechanics are not that complex). -Samudra-gupta: the conqueror, put in place a great army, which probably included a navy. More combat, and military production speed bonuses. -Chandra-gupta II: patron of learning, similar to the previous one, but maybe the greatest. Brought to maturity the empire. Production or more tech speed bonuses. -Skanda-gupta: protector of the empire, successful against invasions, considered the last of the greats. Maybe structure's arrow count bonus. As an alternative, Aryabhata I: famous thinker (math, astronomy, physics), if having these non-combat heroes is a thing. Could greatly accelerate tech research speed when garrisoning a building. It’s hard for me not to give importance to the learning advances in this period, which I can only translate to tech research speed in the game (maybe could be balanced by having lots of techs to research). The Nalanda mahavihara could be a related unique structure, possibly a Wonder. Another unique structure could be the Delhi Iron Pillar, and the Aśvamedha ritual a unique tech (both could increase Hero/emperor’s stats).

Мы строим качественный дом каркасный под ключ быстро, надёжно и по доступной цене. Это позволяет владельцам быстро переехать в новое жилье и избежать длительного ожидания.

The only issue with Neapolis is that it is a very Hellenized town. There are some similar situations with the Saka (Eastern Scythians), notably Chirik-Rabat, a fortified town with Chorasmian architecture. 

I don't think this is a problem to have various designs, and I believe the proposal of @wowgetoffyourcellphone is justified. We need to have a flexible concept, sometimes we'll want to represent a people or a civilization from a specific period, sometimes a nation, sometimes an empire, and sometimes a dynasty. We just need to be clear about it and explain it well in the civ's design. Edit: And it’s really good to finally start thinking about what comes next. I felt like this 'Empires Besieged' expansion was constantly being put off until tomorrow, and that people were refusing to give it any thought. It’s clear that not thinking about it creates problems for the expansion’s design, and that we really need to lay the groundwork now, despite the lack of leadership.