Well, he's also a (assuming you complete all side-quests, S-links, etc. which from certain conversations in P4 suggests this is canon) genius (top of his class), badass (fearlessly leads a team sacrifices his life for his team and will even eat Fuuka's cooking), casanova (Besides Aegis he woos at least 5 other female students, a loli, and a teacher) who's an expert with short swords, long swords, bows, spears, axes, kick-boxing, and, of course, he's a bishounen.
Plus there's the whole fact that Aegis sealed away Death inside him for 10 years, but doesn't fully remember the event. All she retains is the "need to be by his side" to monitor Death. After that whole ordeal and when she becomes 'human,' she realizes that she loves him.
Minato is simultaneously a sleepy, lazy person, as well as a badass hero. He's just so chill all the time. And, for the record, they're both cute in this.