One of the characters in my story, named Jarvis Coltrane, is a high ranking commander for a military organization against supernatural forces. He has seen a lot of strife and suffering, and is very uncaring, unsympathetic, sharp-tongued, uninterested and sometimes unfeeling. However, his Achilles heel is one of the members of his elite faction: Aleena Lockhart. Aleena came from a troubled past and while on the run, ended up with Jarvis and the military when she was a little girl. She was raised by Jarvis' group of four elites, and Jarvis came to see her as his daughter, even though they aren't related. I want to portray that Aleena is very special to Jarvis and that she's the only person he would be willing to die for. But I'm worried this will go against his character. He is the most unfeeling and cool character in my story, and having him suddenly gush out over Aleena feels wrong. I also want his actions to contrast the character of Aleena's real father, who would go to the length of killing her to make sure he got his way, proving that blood ties don't always equal love and protection. How can I portray that Jarvis values Aleena like she's his own flesh and blood without breaking his character? Any advice is appreciated!