Warhammer Ancient Battles
Warhammer Ancient Battles is a miniatures wargame by Games Workshop that took place IRL. That's about it. It was spearheaded by Jervis Johnson, Rick Priestley, and the Perry Brothers. Sadly, the game is defunct, as of May 2012. Interestingly enough, it uses very similiar rules to Warhammer Fantasy Battles.
The game has dozens (123 to be precise, including Chariot Wars lists) different playable factions, though many of them are extremely similar (the basic unit for ten different factions is the humble hoplite , for instance), and many of the armies are simply variants of the same faction at different points in history.
Characters are by-and-large generic, with only a handful of named characters, all of them army generals, such as Alexander the Great or Hannibal Barca. The game does not involve nearly as much customization or choice within each faction, character options generally being "can be on a horse, or a warhorse, and the horse can have barding" as the only customization choices, unlike the long equipment lists someone familiar with Warhammer 40k would expect.
As all of the units are either generic humans on foot, generic humans mounted on horses, generic humans mounted on chariots, or generic humans mounted on elephants, most unit models have a basic statline of WS3 S3 T3 W1 I3 A1, with the relatively minor differences setting apart different units.
Unlike WH40k, where critical leadership tests are relatively few and far between, in Ancient battles, a single failed leadership test can route your entire army instantly, as fleeing soldiers panic their nearest comrades in a domino effect, leading to tantrum spirals rarely seen outside Dwarf Fortress.
Ancient Battles is also notable for being a GW game that never received official miniatures, meaning that even when it was officially supported, any and all minis were welcome. Despite no longer being supported, it retains a fairly active community, especially in some areas, with large tournaments still being held six years after it was officially squatted.