I've been thinking 2 different fanfic ideas where Ichika dies in Novel but gets a 2nd chance.
The first story concept would start a week before he enters the IS Academy with all his knowledge and experience. But this time around he's done being pushed around. So instead turns down being a pilot so he can simply have his personal private dorm room. It would be more like a one bedroom apartment for him. So on his first day he would ignore Houki and Chifuyu completely while reading his IS book. And immediately befriend Honne and help out Maya Yamada. Petty much he would be developing in his way. If Houki request speak to him privately. Ichika will calmly respond with "Whatever you have to say, you can tell me infront of everyone". Dismissively with a calm and somewhat cold tone in his voice.
The second story is after dying he wakes up in the IS Academy infirmary and when he's waking up. Ichika sees a black blur for a minute or two and then once his vision clear. The person laying their head right by his hand while grasping it with warmth and compassion is Madoka. But she looks like the image up top. And for that time Ichika is speechless seeing the person that looks completely different. Then he starts feeling his soul merging this Ichika along with his memories. Through this he gains heightened sense, reaction, strength and durability. But now he's dealing with this Madoka having deep romantic feelings for him to a point that she whispers "Ichika-nii I only want YOU to look at me and never take your eyes off me". Plus being Alicia's secret protégé. So in this he's known as the ultimate strategists