Japanese Password Translation
Talk to Konohamaru or the guy in the main town's ninja school to use the passwords. Unless you can read Japanese, you should consider the password entry menu a 4x4 square and one where you may input the following passcodes.

|--------------|
|--0--1--2--3--|
|--4--5--6--7--|
|--8--9--A--B--|
|--C--D--E--F--|
|--------------|

Use the above layout and press these symbols to unlock the following:

0 - F - D - E - 1 - 4 - 3 - 6 -- Kankuro unlock item.

2 - 6 - 7 - 0 - 9 - 1 - 4 - F -- Third Hokage unlock item.

7 - 5 - 8 - 2 - F - E - 1 - 6 -- Temari unlock item.

3 - E - 5 - 8 - 0 - 1 - 9 - F -- Gaara Unlock item.

9 - 6 - 3 - F - E - 0 - 8 - 1 -- Iruka unlock item.

6 - 9 - 7 - F - 1 - 5 - 3 - 4 -- Kyuubi Naruto unlock item.