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None of the above. Also you further proved that almost all the characters in bleach are shaman in your opinion. and Vaizard are not a group of people. They are like hollow shinigami and Arrancar, they are simply Vaizard, Vaizard is not the name of an organization.
I have already said they are in the same class because their powers are like that of a Vaizards.
Orihime's shields are much like the barrier the Vaizard made(meaning that is her trait of the Vaizard and making her in the class of Vaizard.)
Chad's arm is like the Arrancar's body when they use their Shikai putting him in the class of Arrancar.

You are repeating the same thing over and over. But please if they are shaman tell me what kind of Shaman they are, I'm annoyed that you simply say they are Shaman. Are they a Necromancer? Nope. Apache? No not that either. Mediums? I think not. Have they communicated with spirits that have already been sent to Soul Society as "channelers" do, no not that either. Don't try the Shaman theory on me, I can tell you now that I practice shamanism as well as wicca as do many other members of my family and close family friends. I know about many kinds of Shamanism, as so far, I know of none that are anything like Orihime and Chad. Orihime and Chad without their powers would be like Tatsuki and Karin, they arn't shaman as they arn't healers, mediums or necromancers. They simply see spirits meaning they are closer to the spirit world than most others.

You're both wrong.

1) Chad and Orihime may exhibit Arrancar or Vizard-like powers at one point or another, but they're definitely not Arrancar or Vizards. Arrancar are hollows who have gained shinigami powers, while Vizards are shinigami who have gained hollow powers. With Freud in mind, Arrancar are beings of id who have gained a superego, while Vizards are beings of superego who have gained an id. Chad and Orihime are humans, ego-beings, who have both a bit of hollow and shinigami, or id and superego. At least I think so, anyhow.

Arrancar = hollow + shinigami
Vizard = shinigami + hollow
Chad and Orihime = human + shinigami + hollow

Not the same.

2) I looked up shaman in lots of dictionaries, and all of them do talk about being able to communicate with spirits. With only this in mind, both Chad and Orihime fit the definition. However, that alone isn't enough. There are plenty of mythologies, stories, etc., of people who see ghosts, but they certainly aren't shamans. Being a shaman means not only tapping into the spirit realm, but also making use of it to see the future, generate miracles, and cure people. While Orihime can heal people, she does it with her own power, and not the power of conjured-up spirits.

If being able to see spirits was the only requirement for being a shaman, then mostly everyone in every mythology is a shaman, as well as everyone in the Ghostbusters movies, and a bunch of other people as well. Being a shaman means not only interacting with spirits, but being able to use the spirits you interact with to cure people, perform miracles, tell the future, etc. Seeing as how Chad and Orihime can interact with spirits, but not control them to do supernatural things, I think they fall a bit short.

Can we all just stop the silly bickering now?

Fair enough but I wasn't saying they were direct Vaizards/arrancar either that's why I continued to use class and traits. I just knew they couldn't be shaman as I practice Apache Shamanism XD.