I was thinking of a possible feature in OpenXcom: damage number appearing over characters, though in XCOM style. This applies to health damage as if a unit takes damage, a -(#) will appear his or her sprite. Shots that are blocked by the character's armor are denounced as (Resist). If a character takes enough stun damage, (Stun) appears over head and if a character is killed, (Dead!) appears over head.
Initially, damage numbers will only appear over soldiers and civilians, but damage numbers will appear over aliens who have been scanned by the mind probe even once. Stun and Dead! will still appear over aliens, even not scanned.