Is it better to let the special get up to 4 before using them?
Like if I built it up to 4 does that mean I can then use them all in succession?
1 2 3 etc....
Or do I have to use 1 then build up to 2 and then 3?
Certain characters can do combos with just each other with level 4 if they are both in play at the same time without spoilers there's kinda more you can do with level 4 special too. It's more like an automatic thing than a combo you attempt though.
However generally you don't need to unless it's all you got.
Really you want a level 1, then a level 2, then a level 3.
However as long as the next element you need is at least the level you want you can still use it.
Meaning if you need level 2 water element but they are at level 3 already you can still trigger them as the second stage of the combo. If that makes sense.