In the vast majority of chess variants, the two (or more) sides have identical sets of pieces at the start. But not all of them do .... In real war, armies facing each other are not necessarily identical, and this has been reflected in some chess variants. One of these, Spartan chess, I already have in the collection.
Another chess variant with unequal armies is Synochess. In this variant, one side, called the 'Kingdom', has a normal western set of pieces. The other side, the 'Dynasty', has a set of pieces coming from xiangqi and janggi (Chinese and Korean chess, respectively).
In the collection, I've got board and pieces to easily put together a Synochess set.
For the board, I picked my 'mahjong' board, as that one combines western and Chinese influences.
A Synochess set with both western and Chinese traits!