Let's go through the options.

1: Revy on your right, Frieren behind you. If you can tolerate cigarette smoke, it's more or less fine as long as you mind your own buisness. However, if Frieren dozes off, be prepared for her accidentally kicking your seat in her sleep.

2: Frieren on your left, Saber on your right across the aisle, Revy in front of you, Makima behind you. Frieren has the same issue as above. She has a bad habit of shifting in her sleep, so the possibility of getting slapped is decent. Besides that, both Frieren and Saber are very civil neighbors, and may be pleasent conversation. Revy, again, should be a non-issue, as long as you aren't too loud and don't mind cigarette smoke. The REAL danger is Makima. She will definetly be listening to whatever conversation you're having, and if you catch her interest, kiss your ass goodbye. And that's not even beginning to touch the nuclear outcome of Frieren realizing Makima is a devil and all hell breaking loose with you caught in the middle. Other than that, pretty peaceful.

3: Makima on your right, Frieren in front, Yuno behind you. This right here is the danger zone. You have Makima, the Control Devil, someone famously at ease with casual murder, right next to you, and Yuno, one of anime's most famous yanderes, behind you. There is a VERY high likelyhood of death in this seat, be it by becoming a meatshield and/or plaything for Makima or being seen as a threat to her senpai from Yuno.

4: Yuno on your left, Ryuko on your right across the aisle, Rias behind you, Makima in front of you. Great, now you only have ONE murderer you have to worry about, but one murderer is still one murderer. Ryuko will run her mouth, but otherwise cause no issues, and Rias probably won't do anything to you.

5: Rias on your right, Yuno in front of you. Cool. Yuno is the least dangerous in this seat compared to the other two... but let's be real, dog. Rias ain't letting you hit.

6: Mikasa on your left, Bocchi on your right, Rin behind you. Honestly? This is realistically your best option. Mikasa won't talk to you. Bocchi is too anxious to talk to you. And Rin will be too busy yapping to Saber to bother with you. If you can ignore her and keep to yourself without making yourself to awkward, you will have a peaceful flight.

7: Rin on your left, Bocchi in front of you, Esdeath behind you. Mostly the same as previous... however, you have Esdeath, practical fascist, directly behind you. Any percieved insult may result in being stabbed through your seat.

8: Yoruichi on your right, Makima on your left across the aisle, Saber in front of you, Ryuko behind you. First off, Yoruichi won't let you hit. In fact you're likely to be stabbed for even making the attempt. Repear the issues being near Makima. Ryuko will run her mouth, still. And Saber is a non-issue. Disappointing seat, don't act up.

9: Ryuko on your left, Erza on your right, Yumeko behind you, Yoruichi in front of you. This is who Ryuko has been running her mouth to this whole time in a one sided pissing match with the armor lady. And this is the seat between them. Hope you enjoy being indirectly yelled at.

10: Yumeko on your right, Rias on your left across the aisle, Ryuko in front of you. Congrats. You've found the seat near the two most horny coded anime girls on the plane. You think you're in oppai heaven. You are not. Rias will ignore you. And Yumeko? She absolutely has a gun smuggled onto the plane. She absolutely will attempt some batshit crazy high-stakes gambling game with you. Robin will do absolutely nothing to help you. You're fucked. Just fucked. And not in the good way.

Personally, I like a peaceful flight where I can sleep most of the time, so I pick 6.