I approve of the idea. If it could be abused, it might end up as a supporter feature, but I don’t think that will be an issue. And as @Shinyuu; if you somehow succeed in breaking the server, I will rather be intrigued! 
But…
Name first
We had a discussion long ago about poses not starting with the name of the character.
It becomes less clear who arrived/left, but it may provide better story telling.
Is that an issue? I don’t know. Clarity vs story telling. Which weighs heaviest?
Placeholders
I think placeholders (e.g. @species) is a good idea, but we might want to expand it a bit.
About gender, by plan is to introduce a gender dropdown option for your character profile (in addition to the free text field) where you can select between symbols representing:
- male
- female
- both (male+female)
- neutral
- plural
The purpose of these will not be gender identity (use the text field for that), but rather a quick visual aid when scanning character lists, as well as a variable to use in message construction.
And to allow us to create more complex and “correct” messages, I have rather been thinking about using some standard like the ICU Message Format, so that we can create travel messages like:
describe A seemingly random car stops near where {name} {gender, select, plural {stand} other{stands}}. After a short exchange with the driver, {gender, select, male {he gets} female {she gets} neutral {it gets} both {sie gets} other {they get}} inside on back seat. The car drives away shortly after.
For a our male character “John Doe”, this would spell:
A seemingly random car stops near where John stands. After a short exchange with the driver, he gets inside on back seat. The car drives away shortly after.
And for our pluralistic cojoined twin character “Anna and Bell”:
A seemingly random car stops near where Anna stand. After a short exchange with the driver, they get inside on back seat. The car drives away shortly after.
(You can see from the example that we get the “Anna stand.”, which isn’t perfect. Plural characters messes things up a bit, as their first name is seldom enough to express their pluralistic nature)
Maybe ICU message formatting is overkill…? I don’t know. But at least we can handle whatever we add in the future, and whatever strange traits other languages might bring.
Mmm, those are my thoughts at least.