Wrenchfarm
Lexcorp Proprietary Technologies
I wouldn't say Jade is particularly safe. Almost all of her specials leave are negative and punishable (or in the case of amp glaives, positive but can be ducked) and her major enforcing poke B2 and major source of mid-screen damage F21 are both punishable by everyone. Then there are all of her negative strings, which in fairness you can avoid using (can't remember the last time I purposely used B12 or F42) but leave her with only a few usable tools.2. Jade is already quite safe. The problem is, she can't take damage. She has to beat you with a bb gun while the rest of the cast gets to use a machine gun.
B3 and B3434 are safe and that's great, but it feels bad to have a character with one GOOD string.
You're absolutely right that the compounding issue is her damage. It's one thing to be negative and unsafe off a bunch of strings and specials, but it's another to have to take so many risks and give up your turn so many times just to do middling damage.