Rav Avraham Abulafia held that Jesus was what is called in the Gemara Suka "messiah son of Joseph"
I asked Professor Moshe Idel about this since he brings it up in his first book which was actually his PhD thesis. But this does not imply what Christians are usually thinking about this issue.
But it is also not the same things as just a saint.
Rather if you look in the LeM of Rav Nahman of Breslov, vol I chapter 65 you can see what the idea of the "Baal Hasade" [lord of the meadow].
The idea there is that there is a meadow which has beautiful grasses and flowers and trees and fruit. And these trees and plants are all souls. And they need watering and taking care of. There can be weeds and diseases that try to attack these beautiful souls. So there has to be someone to do that work. That is a true tzadik. But even to get to that level to do the slightest smallest work in meadow requires a very great saint.
[There is a lot of animosity towards Jesus, but that is because people are not aware of Avraham Abulafia. Even among Christians people are ambivalent towards Abulafia, even if they hear about his insights. This seems sad to me. Now while he was not at all positive towards the catholic church that is clearly because of the problem of worshiping Jesus which can not be correct. But that does not mean to go to the opposite extreme and start speaking slander about who was really a very great tzadik and even more. For most tzadikim do not have a soul from azilut/emanation. ]
The sugia of messiah son of Joseph is brought at length in the Gra's Kol HaTor.
[It does seem that Rav Nahman himself was not careful about the signature of the Gra. However he was not in that category himself.]
