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##3var, 14 11 8 bytes##

iii       # set A to 3
   s      # square A to 9
    d     # decrease A to 8
     s    # square A to 64
      i   # increment A to 65
       P  # print A as ascii

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3var, 14 11 8 bytes

iii       # set A to 3
   s      # square A to 9
    d     # decrease A to 8
     s    # square A to 64
      i   # increment A to 65
       P  # print A as ascii

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Saved 3 bytes thanks to Joffan.

##3var, 14 11 bytes##

iiisd        # set A to 8
     -       # set R to A-B: 8-0 = 8
      <      # set B to R
       *     # set R to A*B: 8*8 = 64
        >    # set A to R
         i   # increment A
          P  # print A as ascii

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##3var, 14 11 8 bytes##

iii       # set A to 3
   s      # square A to 9
    d     # decrease A to 8
     s    # square A to 64
      i   # increment A to 65
       P  # print A as ascii

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Saved 3 bytes thanks to Joffan.

##3var, 14 bytes##

iisii           # set A to 6
     -          # set R to A-B: 6-0 = 6
      <         # set B to R
       @ii      # set A to 2
          ^     # set R to A^B: 2^6 = 64
           >    # set A to R
            i   # increment A
             P  # print as ascii

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##3var, 14 11 bytes##

iiisd        # set A to 8
     -       # set R to A-B: 8-0 = 8
      <      # set B to R
       *     # set R to A*B: 8*8 = 64
        >    # set A to R
         i   # increment A
          P  # print A as ascii

Try it online