JimmyandFriends' File Number

The JimmyandFriends' File Number is a type of FCV created by JimmyandFriends. It has the format of LNNNNLNNNNNLL.

First 12 digits
The first 12 digits are based on above table. For the first 5 digits, in cartoon, book and game characters, the first 5 indicate the month and year of first appearance (example: A1997xxxxxxMx - a male cartoon character first appeared in January 1997), and for anime characters, the first 3 out of 5 indicate the date and month of birth while the last 2 of the 5 digit section is random. The 12th digit indicates gender for a cartoon or a book character or blood type for an anime character.

Checksum letter
The final character of JimmyandFriends' file number is a checksum letter. A mathematical formula for checksum is:

$$(10x_1 + 2x_2 + 4x_3 + 6x_4 + 8x_5 + 12x_6 + 14x_7 + 1x_8 + 3x_9 + 5x_{10} + 7x_{11} + 9x_{12}) \pmod {24} =\\ \begin{pmatrix} W & A & B & C & D & E & F & G\\ H & I & X & J & K & L & M & N\\ O & P & Q & R & S & T & U & V\\ \end{pmatrix}$$

The remainder corresponds to a letter: