Ive been using him for awhile now and wanted to offer some strats for him. Some people know that he is very slow and he has very bad recovery time on some of his moves. Dont be fooled by this because necroif use right can be very deadly in the right hands. One main tactic i like to use is his jab hook has great start up time and is very good in pressuring your opponent. Jumping with necro is very bad IMHO the only strong move he has in the air is his j.back or j.forward strong. Since his limbs are so long this works pretty good against a lot of ppl. i prefer to use jab hook its fast and is a lot better then jumping with him.
Necro doesnt have many combos but his target combo is B+short, strong you can cancel off his s.strong into the SAI or SAIII. Also to be a good necro player you must know how to parry very well.
Necro also has a air juggle which would be B+Fierce a lot can be done with this. One of his best air juggles is B+Fierce and Db+Fierce the stun is pretty high.
I want to know some good strats with him like what SA you prefer. I like the SAI and SAIII the i havent really used his Slam Dance. If you know some strats that benefits his game then offer them.