Alright, good job.
This part is for new friends and reasons to make himself feel better.
Protagonist
When they first meet it's under attack. Aki brings a shadow to the Dorm because there is no choice. And after when the threat is done, there is little interaction. He asks that after he comes back if the protagonist will continue leading. I think part of that is because he might have been that leader before back when there was an accident with another member and so he can focus on healing and getting his strength back. They do become good friends and when the end comes Akihiko is hurt by what happens, he is hurt that the protagonist is gone. In FES, even though he is pained by what happens he still chooses to go through with how things happened. In P3P, the protagonist can be a girl and a romantic relationship can be forged with Akihiko or you can get bro-zoned depending on the choices for the options.
Iori Junpei
Akihiko recruits Junpei into SEES, he finds him crying in a convenient store. Aki and Junpei have a friendly rivalry which can been seen fully during Operation: Babe Hunt. Their interactions are funny but sometimes serious. Akihiko also doesn't seem to understand Junpei's feelings towards Chidori. Junpei is that one kid that Aki just doesn't get but they get along none the less. I think for Akihiko recruiting Junpei was a step towards redemptions. If he can save Junpei then he has more control. If Junpei can defend himself against shadows then that's one less person he has to worry about. After the events with Chidori and nearly losing Junpei, I think Aki could better understand him. As they both lost a love one.
Yamagishi Fuuka
For Aki, I believe that saving Fuuka was the most important thing in the world. Not because he is in love with her or knows her though. But because she is a younger girl that needs protecting. Aki was unable to help Miki, his sister. He didn't want to just leave Fuuka, so he did everything he could do to save her. It didn't matter what it cost, he was saving her even if it meant by himself. As a child he was held back from running into the burning building where Miki was trapped. This time there was no one strong enough to stop him and he rushed head first. Though they save Fuuka, Aki doesn't have a whole lot of scenes with her. Saving her was priority number one. After that he suggests that she take Mitsuru's place. I think another reason for that was so she would be safe and out of harms way. But also to help keep the rest of the group safe too.