But Hugo hasn't been exclusively using spells about tentacles, so why would it be that?
Yeah, unless Hugo's covering himself in tentacles too then it's not really a tentable noble phantasm.
The amount of times I've actually escaped death kat might have "immortality".
Related, Super Robot Wars characters that die in their original series instead escaping death and then joining to your team. Master Asia, Lalah, Purus I and II (they even get team attacks despite, you know, they trying to kill each other every time they meet) and Kathejina, Gato, the Daitarn 3 subpilots, Musashi, Char and Amuro survive their climatic battle usually too. Gunbuster protagonists get to keep fighting after their finale as well. Even most of the universe survives Ideon. Kamina still dies every time though, I guess that's supposed to be too much of a plot point, but Nia gains about a century of extra time after defeating the anti-spirals so Simon gets to actually enjoy a married life.