Void Princess is still the best out of the 3 Aisha classes overall. I can't really say much about her since I don't play her but I can give a general consensus about her. Well, for a fact, she is considered the best Aisha class by the majority of the community and from what I've seen, she is very strong. You only need about 4-5 skills with her, but it's up to the player to create the windows of opportunity in order to use them.
Hell Stone - Special Active. About 2600% (3300% in awakening) in damage when all hits connect. With the awakening multiplier of 1.2, the damage comes close to that of a 200mp skill. This move smells corner rape. The positioning has to be correct in order to maximise the amount of hits you can get off of it (when outside of the corner anyway). The skill will launch the enemy on the second spin. Noting this skill will give it a chance to not launch the enemy at all. If you're playing on the KR server, this move gets nothing but buffs. The biggest being this moving changing from a 120mp skill to a 100mp skill. If this were a 100mp skill, I'd call it the strongest one out there.
Death Field - Special Active. About 2000% in damage and 2400 with the Awakening Multiplier. While this skill isn't as damaging as the above it has deadly effects. First of all, it is a two-part skill where the first part cripples your opponents movement speed and disables their use of skills, which allows you to freely combo them afterwards or follow up with Petite Angkor(your cute little dangerous bat). The second part will cause your target to explode and take a lot of damage, and it is where the damage portion of the skill comes from. You can choose to combo your opponent after death field or not, but when you do it gives them a chance to either get knocked down or mana break which may cause the second part of the skill to miss completely. This move comes with a bit of thinking as using up 200mp is very costly.
Mana Steal - Active. As the name suggests, you take mana from your opponent. 36 mana from the cost of 12 (only 2 when noted). The move will stagger your opponent when it takes mana from them but will not in cases of lag. Not much to be said about this other than being Aisha's free source of mana gain when used in a combo. Good move.
Aging - Special Active. Around 4300% in damage and 5200% with awakening multiplier. While this move costs 250mp, once it hits, will give your opponent the Aged status which lowers your opponents movement and attack speed and also decrease their mana over the course of 15 seconds. This move requires you to distance yourself from your opponent a bit in order to land it properly. It should be roughly about the same distance as you would position hell stone, or a bit further back.
Petite Angkor - Active. 875% and 1050% in awakening. Another skill where damage is split into parts where the explosion makes up most of the damage for the skill. When used, the bat will move horizontally in one direction until it either latches on to someone or flies off the screen. It is possible for the opponent to shake this skill off of themselves or time awakening/buffs/special actives and escape from the explosion damage, but if used in a combo that won't be happening. One of the stronger actives in terms of damage and only if all hits connect. Even if it doesn't, the damage over time is really good. Once the bat latches onto your foe, you can go batshit crazy on them, literally.
Teleport - Active. A skill I have a lot to say about with mixed feelings. It's a skill that's lovely to use, but hated to be used against. 10MP initially. 6MP with Teleport Study. 14MP when noted. 10MP with both Teleport study and the note. Aisha's main skill for mobility. It is by far the most annoying skill in the game and is the bane of every player VS an Aisha. At the start of a PvP match, you'll want to just stand and charge some mana then move around with teleport once an opponent gets close. The main use for teleport isn't running away but for better positioning (you'll learn about this once you become a really high level Aisha player. Rank doesn't determine a skill of a player but it has some value. You will find that even among S and SS class Aishas, there will be players who do nothing but running around all day. These ones are utter trash in my books) The general rule is that one on a higher platform will always have an advantage over someone on lower grounds. For example, in the Elder stage where you first fight William, You'll be starting on a higher platform. Unless your opponent is an Aisha or Rena, they will charge at you and most likely jump or so. As an Aisha, you could choose to teleport away or instead fall through the platform and attack with Aisha as you have the height advantage. The majority will choose to teleport away instead of taking the opportunity to get in free damage. You will also find that once an Aisha is on a losing end, they will continue running forever. I find this to be understandable, but unless you're running away in order to think up a strategy, there's no point in teleporting away. Most do so in fear of losing in ranked or just because they're paniking, but this can be said for all classes, not just Aisha. As much as I like to bash on Aisha players that run all day, teleporting does have it's own advantages as continuous use may cause your opponent to lose their cool, which is a plus side for you since they will tend to make more mistakes such as charging at you head on in which you can take advantage of and respond in kind. Another thing regarding this skill is that you will find people call you a runner at times. Whatever you do, it's best to ignore these people and continue playing as it will not do you any good. These types of players are the ones that will never improve as they don't learn from their mistakes and just trash talk their opponents. They are also very toxic in the community and halts a players growth.
For skills. With only an A slot: Death Field/Hell Stone, Petite Angkor, Teleport, Mana Steal would be the best choices.
With a B-slot as well, whichever between DF/HS you didn't pick before, Flame Circle, An Aura Accelerator, And Aging would be best.