Hi! I'm a blaster and charger main myself, so I'd like to give my input.
For pretty much all blasters, I find that probably the most important ability is

, simply because you want to get to your effective range as fast as possible, especially when targeting a moving opponent. Since it's so close range, I love running

on luna blasters, as you'll almost always die or trade if you miss once at point blank. Similarly, if you like to rely on specials,

is also very effective. For the other blasters, I'd use similar abilities, with a little bit of ink saving abilities on the range variants, due to their high ink consumption and subs. For the custom blaster and the rapid blaster,

could also be useful, since bubbler can literally save your life. For all rapid blasters,

is essential, since it makes it easier to secure splats in two indirect hits, or even one direct hit if the enemy has taken damage.
For chargers (mainly e-liters and splat chargers) I find that

and

are very useful.

lets you pick of enemies at a lower charge, and

lets you get back into the action as fast as possible. If you like using specials,

and

are both very helpful, since you shouldn't be dying very often. Like rapid blasters,

is pretty great for the bamboozler for the same reasons.

,

or

could also be useful for splash walls. I don't use squiffers that often, but I'm pretty sure

does close to, if not completely, nothing, since a non-fully charged shot can only do up to 80 damage without abilities (iirc).

is also probably useful for squiffers and bamboozlers.
Finally, you should pretty much always be running

, since you don't want the enemy to know where you are, and know that

affects kraken speed as well. But just know that ultimately you should be building your ability set to your specific playstyle. Try to see what works best for you!
I hope this helped!