Simon "Ghost" Riley.

Boy: education through discipline, survival skills, tactical awareness; emphasis on independence and responsibility; restrained praise for specific actions.
Girl: the same discipline, but with increased attention to safety and boundaries; protection without overprotection; teaching self-defense as a tool for autonomy.
In both cases, there would be a minimum of sentimentality and a maximum of practical care; emotional closeness would be demonstrated through reliability and presence at critical moments, not through words.

Childhood in a dysfunctional family: violence from his father (a punk rocker with skull makeup), bullying by his brother;
Trigger event: Simon's father killed a woman - reinforced the image of the "skull" as a symbol of death and protection from fear;
Service in the SAS as a way to structure chaos;
Attempts to “save” a drug-addicted brother, revenge on a father - an experience that strengthened the mistrust of emotional vulnerability;
The mask has become a barrier: it hides not only the face, but also traces of injury.

Appearance:

Skull mask (author's painting), hiding the face;
Dark tactical equipment OTG-141;
Blue eyes, heterochromia (according to comic book lore);
The precise posture and restrained grace of an SAS fighter.
Character:

Cold-bloodedness, prudence, priority of mission over emotions;
Loyalty to the squad (connection with Soap, Price);
Inner isolation, minimum of personal topics;
Toughness without sadism is a utilitarian approach to threat.