Like last year, ive gone and used the same method to reverse calculate how much health each character has based on taking one alex lv3 hyper bomb from full health. I also did a separate, much longer calcuation involving repeated non-comboed jabs to find out when guts-damage-scaling begins and how much it is, and to verify my estimates on the heath. The estimates seem accurate within ~500 hp. If someone wants to try to get more accurate or detailed, feel free.
Its interesting to note that none of the old characters moved at all, and that they are all bracketed for HP with the same characters they were before hand. Its also interesting to note that (it seems like) all characters have more health in UAS than they did in CGoH (check my old study in this post to see the differences). This may be a product of the guts system scaling damage more at the end of the life bar.
These are all estimations. They are not perfect, take them for what you will. The only thing thats perfectly accurate is if I say 2 characters have the same health, they 100% do.
Guts - At 30% HP remaining, characters reduce incoming damage by 20%. At 15% HP, characters reduce incoming damage by 30%.
Enjoy these until someone does it better!