As already stated earlier this match-up is 7-3 in Nu's favor. Tager is gonna be spending well over half the match just trying to get in range to do anything to you even if your magetized! In this match he can't spark bolt you and throw out whiff drive attacks, 6A or Slede hammer B (Remember if he whiffs this not if you block it. He has frame advantage if that happens) to drag you in range cause with the long start up times on most of these will give you plenty of time to at least 5d him on reaction or god know what else you damn nu players can do which can equal 25% - 40% health lost, a knockdown for you and most likely got thrown across the screen.
Because of Tag's limited mobilty he has very few options of approaching you. Obviously the first one is using sledge hammer to close the gap. A good chunk of Tagers will try to start to round of with this hoping to catch you off guard and save themselves alot of stress but Nu's backdash will get you out of this easily.
Next he might try to s.j. c. His j.c gives him a little bit of forward momentum after that he's gonna barrier guard on his way down. You might want to be careful that of how close he is after that. He might be at max range to sledge hammer you, tag you with a 5D, tager shot, or even buster you if your magentized.
His last option that I can think of at the moment is,... well his tager shot. If your not fully prepared for it this attack could be death for you. On counter it wall bounces which pretty much guaruntees your gonna lose at least half your life if you don't burst. This move alone would be his saving grace against zoners if not for one thing. His Electric Meter needs to be full. Now if charged over time I'm not really sure how long it'll take to charge up but in this match-up it seems to take for f****** ever! He could use his 421B Voltic Charge to add meter to the guage. The move shares the property of being immune to projectiles while active but also have some immunities to some physical attacks above the waist or something like that but if the tager is dumb enough to just sit there and charge these laser up in front of you like that throw the hell out of them or something just as stupid. Going back to the Tager shot one last time if you have a health lead and know tager is planning on using it and is trying to fish for a counter hit. Just sit on the lead as long as you have enough space between the two of you and your not in the corner.
This match-up is a test of patience for Tager and your job is to break,....NO SHATTER their spirit and make them either want to quit playing all together or change characters for an attempt to counterpick you but your Nu-13 you can't counterpick her she as no bad match-ups!