Not sure what's been posted here and what hasn't, but...
1. The ability to write messages after a character dies - but limit it to roleplay messages or possibly (?) OOC messages.
1. The ability to choose a name for your unit's captain once one is found, or have an option to rename them. Would be optional and in addition to the randomization of names already.
1. The ability to "attach" adventurers (other player characters) to units with their permission. When attached, they lose the ability to travel on their own (unless they remove themselves from the unit) but have new options like the ability to train soldiers (effectiveness depending on their skill level), raise morale, scout bordering regions, etc. Attached adventurers automatically fight in any battle the unit engages in, and have the chance to be injured, seriously injured, killed, etc. They can also be "promoted" to captain and would replace your named captain, if you have one. They cannot move the unit on their own, and their communication isn't expanded here - they use the same message system as before.
1. Death. Everyone has a small chance of death, and class choices augment this slightly - heroes would still be the riskiest, with courtiers having the least risk of death.