Kyuubi Chakra Mode (Kurama-Linked) for sure.
Tons of uses. (Speed, Regenerative healing, Lasers, Bombs, etc)
Not only would having the Rinnegan make you look like a freak, but I assume the techs would be quite taxing.
I'm pretty sure that a normal human being wouldn't be capable of containing Kurama without dying. Naruto could only contain Kurama because he was an Uzumaki. Not only that, but the abilities you listed would require extreme chakra control, which would take years to learn let alone master. |