You might as well just state that the weaknesses are the common sage mode traits, although I guess there is good reason for that notation. Interesting how smell is labeled there as well, perhaps there is hope for smell-triggered genjutsu users yet.
You can absorb the chakra of fire jutsu, however, I just have to ask as to what fire jutsu you can't absorb. You say almost any fire jutsu, and I wonder if that consists of Katon, Ameratsu, etc. or if it also concerns fiery derivatives like scorch and explosive (if you consider that fiery).
If you can also absorb the chakra via inhalation, then that would suggest that either your insides are also fire proof (more or less) or that the fire is converted to more harmless forms of chakra upon entry. My guess is the latter, but since it will only work from the front, it doesn't seem as much like an undertoned Preta Path.
I presume that the water releases are due to your natural affinity for water, since the sage mode itself seems very fire oriented.
With terror bark, perhaps more description of what it could do to a person might would be helpful. Tearing through the rocks and the ground, is it concussive like most sound techs of that type, or does it have a cutting edge as well? Is it gonna knock someone out or just fling them halfway across the arena?
Creativity points for riding earthen pillars like... err... rides. And since they're coated in natural energy, it can be presumed that senjutsu would also be an effective way to take them out as well.
Regarding the Cerberus pack, I kind of like the tone, though I wonder what the definition of complex taijutsu is.
Finally, though this is more nitpicking than anything, a space between modo and the kanji for Cerberus.
So yeah, nice, I can only imagine how much this will grow as you become more familiar and comfortable with sage mode.