Nonattorneys may commonly represent taxpayers in N.H. Rev. Stat. § 76:16, N.H. Rev. Stat. § 76:16-a, and N.H. Rev. Stat. Chapter 83-F appeals before municipalities and the board. Nothing in this section shall prevent the board from denying representation by any individual it deems to be improper, inappropriate, or unable to adequately represent the interests of the taxpayer.