Main Character in CB is intended to work as "slave duplicator". It still can affect offsprings to lower any essence tier by -1 and breast size can increase or decrease randomly.
Elf's tattoo is mostly a visual, IMO. But I'd like to use it on any slaves in a pregnant state to differentiate fetus count state.
Up to 3 will be normal color, 4 is 50% red-ish, 5 is 100% red:
View attachment 4184789
It was an experimental concept and a workaround because there's no reliable way to change fetus count sprite in slave's status tab below.
Additionally, tattoo now works on every race (without additional traits applied) during pregnancy and tied to clothes so can be turned off if "clothes" is unchecked in slave's info tab.