Yes Accelerator is extremely powerful he has a number of weaknesses’ that Ranma could exploit. The easiest is that he can’t reflect something if he doesn’t know the correct vector equations for it. There is little difference between ki and magic. However while Magic is to complicated to be completely redirected a ki blast would be so basic that that it would be a complete unknown so Accelerator wouldn’t be able to completely redirected. Redirecting a vacuum blade would just funnel air into it resulting in a blast of air. While it would take some ingenuity (which isn’t hard for Ranma) a Hiryu shoten ha could also work as Accelerator as he can’t use his Aerokinesis if the wind is moving in an abnormal direction. There is also dividing his focus which is how Amai Ao was able to shoot him in the head. Finally Accelerator himself mentioned that suffocating him would work so maybe a variation of the Deep-Sea Demon Wrap.
There´s extremely few and far between things that he doesn´t know how to affect at all. Even just his autodeflect handles
almost anything on its own.
If ki and magic was anything the like, someone in the Ranma-verse WOULD have figured out how to use ki to replicate magic, AFAIK, noone ever did or even thought it realistic.
I have severe doubts a ki-blast would do more than cause some puzzlement for Accelerator. It´s energy of a kind, and his ability works on energy without problem. Might not work
perfectly, but feels unlikely to fail.
Vacuum blades may get a "return to sender" redirection rather than explode. Also, vacuum blades exploding is a blast of air, something his ability completely nullifies. Having them implode MIGHT in theory be able to exploit one of his weaknesses, but it´s uncertain.
"Accelerator as he can’t use his Aerokinesis if the wind is moving in an abnormal direction"? Ehm, where did you get that from? AFAIK, that´s simply not true. It will throw off his "aim" a bit(possibly even a lot), but it wont
stop him in any way. Also, the amount of force needed to seriously throw him off is MASSIVE.
And a Hiryu shoten ha is potentially extremely dangerous for Ranma, because Accelerator WILL notice the setup looong before it can be activated. Also, there´s near zero chance for Ranma to get him to follow the proper setup "steps", Accelerator is NOT a martial artist and he doesn´t care the slightest about moving like such, he generally either stands still or goes straight ahead to attack.
He´s also generally a "cold and calculating bastard", trying to use him as the hotspot may not even work at all unless he´s got really worked up first. And for that to happen, Ranma needs to survive long enough to actually get him riled up(as in angry, excited probably doesn´t work). Probably much easier after he finds out he actually DO cares for something, but even then he might just laugh it off.
OTOH, if you use him post-nerf, sure then you have the time limit hampering him, problem with that however is that he´s likely to just make SURE he downs any enemies well before the time runs out, and that´s probably MUCH worse for Ranma as one of his main advantages is that he´s good at playing keep away until he figures out how to handle an opponent.
Divided focus certainly works, but seriously, how likely is it that he will
need to do something on the level of a supercomputer just as he´s fighting Ranma? Zero probability that it will both be that kind of level AND something he cares enough about to actually do rather than kick someone´s ass.
Suffocating works of course... But, huge problem with that is that most ways to do it means FIRST getting into direct contact with Accelerator and that just isn´t going to work.
Deep sea demon wrap probably isn´t going to work, the vacuum part is only momentary and the rest of the effect is just a minor inconvenience to Accy. Several in quick succession should work to unsettle or mess with him but unlikely to do much more than that.
And doing several of them quickly, i doubt that Ranma even CAN do that.
In my view, the one thing that is most likely to work well is for Ranma to figure out the same thing one person in the anime uses against Accy, the "backwards punch" or whatever to call it, basically reversing a punch just as it comes in contact with Accy, exploiting his autodeflect to actually cause the hit instead of deflecting it. Although uncertain if there´s a simple counter for that.
Though since Accelerator would be far more willing to go all out in a second confrontation. It is a given that Ranma will end up seriously injured.
Remember, this is the guy who before running into a certain annoying little girl, had absolutely no qualms about killing. There´s a definite risk that someone who can hurt him, him going all out means
dead opponent. And quite possibly "dead" as in "itty bitty pieces scattered far and wide over the countryside".
Finally the Kiseru/Fan Throw follows the same principles as Vector Manipulation
In the way that a bow and arrow uses the same principles as a battleship cannon maybe. Accelerator does not just redirect, he can add or remove forces almost freely. There´s very good reason he retains the #1 ranking even after his "brain surgery by bullet" nerf.
As for other level 5 that might not be as hard as you make it out to be yes if Mikoto went at him full power she could roast him easily but she’s not the type to go full out on the first strike and as shown with his fight with Rouge Ranma is durable enough survive a lightning strike even multiple ones and that was magically enhanced.
A lightning strike is nothing compared to what Misaka can do if she WANTS to. She could cause dozens of lightning strikes per second and still not be at her limit. Only reason people don´t die like flies facing a flamethrower around her is because she doesn´t want to kill. It´s noted that she can generate enough electricity to run a small city, for hours, before even beginning to tire.
A lightning strike is puny in comparison.
However, she can also see electricity perfectly(which is why she by default is an uber hacker) and her control of it is on the level where things like "nonconductive", "faraday cage" or "lightning rod" are completely useless, not even annoyances to her. Remember, she was capable of figuring out how to run her own nervesystem with her power, with only the sideeffect of becoming a walking taser.
She COULD do the same to OTHER people, effectively remote controlling them and electrocuting them at the same time...
Mugino would probably be the easiest to deal with as she tends to underestimate people and rely heavily on her powers.
Yes, but he´s dead the moment she actually hits him with anything. That´s the problem with her, her power is so freaking insanely destructive, remember, even just her mm-thin shield disintegrates metal
instantly. It´s even outright stated as "effectively armourpiercing"(though a better translation is likely "armour IGNORING").
Even Sogiita he could probably handle given the guy’s fighting styles.
If it was just a matter of "normal" fighting, oh yes easily. Problem is Sogiita has a bag of tricks to add to the mix that would make some superheroes cry. His abilities are pretty much bullshit hax. >>>"Haratani Yabumi said to Kuroko, regarding Gunha's powers: "What you saw was all just an illusion. It would be better for your mental health if you think of it like that. Maybe...""<<<
The level 5’s who would really give Ranma trouble are Misaki and Kakine
Shokuhou if she was in any way serious would be instant loss for Ranma. She hi-jacks brains as a "ranged attack". And she does it to a level that is beyond belief.
ALL level 5s would be dangerous to him, it´s just that Mugino and Sogiita have psychological exploits that MAY be relatively easy for Ranma to use(although if he messes up and use them in reverse between the two, that would be a craptacular screwup instead, lol), and he MAY be able to figure out the exploits against Accelerator(i wouldn´t bet much on his survival long enough for that though).
It’s more like Accelerator would care as the fact that the Sister’s were so emotionless was one of the ways he rationalized killing them because it allowed him to convince himself that they weren’t human. Them showing a little more emotions could possibly catch him off guard.
Possibly. He rationalized it yes, but it wasn´t until midways in that "experiment" that he really started to get adverse to killing, his background showed a lot of people that almost certainly got killed(because they attacked him one way or another, usually with weapons(IIRC that also includes showing a tank as one of those "weapons"...)).
I was more referring to those setting things up though(ie "controllers"). Some of them would certainly react, but most would likely rationalise it away like they already did.