Mii

Originally created for the Nintendo Wii (and backported to a selection of DS/i games), the Mii format was expanded with a larger selection of facial features and a new "copying" permission for the 3DS family, and later implemented as-is on Wii U.

See Mii Maker for the application chiefly designed to create, edit, delete, and trade Miis or convert them from and to a QR code.

Mii Database

Format of the Mii main database CFL_DB.dat, found in shared extdata archive f0000000b.

Offset	Length
0x0	0x4	Header "CFOG" (Mii Maker section)
0x4	0x4	Header 0x00010000
0x8	0x23F0 (100 * 0x5C)	Array of owned (saved in Mii Maker) Miis. Order in file is unrelated to canonical order in-app.
0x23F8	0x4	Header "CFHE"
0x23FC	0x4	Header 0xFFFFFFFF
0x2400	0xA41E	Array of objects? See chapter
0xC81E	0x2	Checksum of all of the above (the first 0xC81E byte). See section below.
0xC820	0x4	Header "CFRA" (Invitations section)
0xC824	0x4	Header? 0x39000000
0xC861	0x2B	Weird padding? 0x00
0xC88C	0x1C20 (?)	Array of Miis contributed from games, used for Mii Plaza "invitations" feature. The format isn't that of a full Mii.
0xE4AC	0x12	01 00 [..] 00
0xE4BE	0x2	Checksum over the data above starting from 0xC820
0xE4C0	0x3D860	Empty (00)

When encrypted in QR codes, 4 additional bytes are added. Two null bytes and a CRC-16. It's the exact same CRC-16 as for the Wii blocks on the 0x5e first bytes. It seems that the CRC is ignored, the Mii Maker expecting the result of APT:Unwrap to detect integrity loss.

CFHE object

A 0xE-byte long item.

On my database, they're all 0000 0000 0000 0000 0000 FF7F FF7F.

Wild speculation: blacklist of already scanned celebrity (gold) Mii QRs?

Alternative interpretation: FFFF FFFF 0000 0000 0000 0000 0000 is the 1st item; FF7F FF7F 0000 [...] the 2nd, etc;

Checksum

The algorithm used to verify the integrity of the database is based on CRC16-CCITT, though it's an incorrect implementation. It is the same algorithm used to verify Mii Data on the Wii.

To obtain the correct value for the checksum, apply the algorithm to the first 0xC81E bytes of the database. This can be done using FixCRC; alternativly a pseudocode implementation of the checksum algorithm is given below:

def crc16_CCITTWii(u8[]: data) -> u16:
    """Calculate a checksum of data using the CRC16-CCITT implementation of the Wii

    This implementation uses 0x0000 as the starting value, which is different
    from what CRC16-CCITT specifies.
    """

    # note: a correct implementation of CRC16-CCITT
    #       would initialize this to 0xffff
    u32 crc := 0x0

    for byte in data:
        # Iterate over every of the 8 bits in byte.
        # Begin with the most significant bit. (7, 6, ... , 1, 0)
        for bit in 7..0:
            # & - binary `and'; <</>> - bitshift left/right; ^ - binary `xor'
            crc := (
                     (crc << 1) | ((byte >> bit) & 0x1)
                     ^ (0x1021 if crc & 0x8000 else 0)
                   )

    for _ in 0..15:
        crc := (crc << 1) ^ (0x1021 if crc & 0x8000 else 0)

    # only return the lowest 16 bit of crc
    return (u16) (crc & 0xffff)

checksum := crc16_CCITTWii(miidb[0:0xc81e]) # checksum over the first 0xc81e bytes

Mii format

Note: 0x18-3B have been copied as-is from the QR code specification, so they're unverified.

Offset	Length
0x0	0x4	Mii ID (see chapter)
0x4	0x8	System ID (identifies owner, for purpose of enforcing editing restrictions and blue pants). Is not tied to the MAC address anymore.
0xC	0x4	Specialness and date of creation (big-endian 32bit unsigned integer): Bit 0..27: (bit[0..27] * 2) = date of creation (seconds since 01/01/2010 00:00:00) Bit 31: not set iff Mii is special
0x10	0x6	Creator's full MAC
0x16	0x2	Padding (0000)
0x18	0x2	Bit-mapped: Birthday (4bit-day,5bit-month), Sex, Shirt color, Favorite (0x40 bit at 0x19)
0x1A	0x14	UTF-16 Mii Name (10 chars max, 0000 terminated)
0x2E	0x2	width & height
0x30	0x1	bit 0: disable sharing bit 1-4: face shape bit 5-7: skin color
0x31	0x1	bit 0-3: wrinkles bit 4-7: makeup
0x32	0x1	hair style
0x33	0x1	bit 0-2: hair color bit 3: flip hair
0x34	0x4	unknown
0x38	0x1	bit 0-4: eyebrow style bit 5-7: eyebrow color
0x39	0x1	bit 0-3: eyebrow scale bit 4-6: eyebrow yscale
0x3A	0x2	note that the bytes are swapped over (little-endian layout) bit 0-3: eyebrow rotation bit 5-8: eyebrow x spacing bit 9-13: eyebrow y position
0x3C	0x4	unknown
0x40	0x1	Allow Copying (?) (0D on 0E off 8D on)
0x41	0x7	unknown
0x48	0x14	UTF-16 Author Name (10 chars max, 0000 terminated)

Mii ID

• Byte 0: generally equals 3 (category?)
• Byte 1: 0/1 = copying off/on
• Byte 2, most significant hex digit: position on page (0-9)
• Byte 2, least significant hex digit: page (0-9)
• Byte 3: generally 0x30 (always for user-created ones?)

Mii categories (pants colors)

Special (gold) Miis

Specialness will override any other color and make the Mii non-editable.

Copying is rumored to have to be disabled.

Zeroed system-id and timestamp?

Imported (blue) Miis

Any (non-gold) Mii with a different System ID will appear as a foreign one.

There is also a range of Mii IDs that are always foreign and uneditable, regardless of the System ID:

Regular (black/red) Miis

Always editable, since they can only appear as such on the console that created them.

Personal (red) Mii

A red Mii that happens to be the first in the file!

Mii values

Each of the following values were found with NTR Debugger: If you want to access the value, grab the given "NTR address" and add 0x08815000.

Data	NTR address	Variation (hex)	Notes
Face style	0x894	00-0B	Not ordered as in editor, read below
Face color	0x898	00-05	From top to bottom
Wrinkles	0x89C	00-0B	Same order as displayed in editor
Makeup	0x8A0	00-0B	Same order as displayed in editor
Hair style	0x8A4	00-84	Not ordered as in editor, read below
Hair color	0x8A8	00-07	From top to bottom
Hair flipped	0x8AC	1 if true	From top to bottom
Eye style	0x8B0	00-3C	Not ordered as in editor, read below
Eyes color	0x8B4	00-05	From top to bottom
Eyes size	0x8B8	07-00	Left button increases value.
Eyes thickness	0x8BC	06-00	Left button increases value.
Eyes rotation	0x8C0	00-07
Eyes spacing	0x8C4	00-0C
Eyes height	0x8C8	00-12
Eyebrows style	0x8CC	00-18	Not ordered as in editor, read below
Eyebrows color	0x8D0	00-07	From top to bottom
Eyebrows size	0x8D4	08-00	Left button increases value.
Eyebrows thickness	0x8D8	06-00	Left button increases value.
Eyebrows rotation	0x8DC	00-0B
Eyebrows spacing	0x8E0	00-0C
Eyebrows height	0x8E4	03-12	Yup, minimum is 0x03
Nose style	0x8E8	00-11	Not ordered as in editor, read below
Nose size	0x8EC	08-00	Left button increases value.
Nose height	0x8F0	00-12
Mouth style	0x8F4	00-23	Not ordered as in editor, read below
Mouth color	0x8F8	00-04	From top to bottom.
Mouth size	0x8FC	08-00	Left button increases value.
Mouth thickness	0x900	06-00	Left button increases value.
Mouth height	0x904	00-12
Mustache style	0x908	00-05	Order like in editor.
Beard style	0x90C	00-05	Order like in editor.
Mustache/Beard color	0x910	00-07	From top to button.
Mustache size	0x914	08-00	Left button increases value.
Mustache height	0x918	00-10
Glasses style	0x91C	00-08	Order like in editor.
Glasses color	0x920	00-05	From top to bottom
Glasses size	0x924	07-00	Left button increases value.
Glasses height	0x928	00-14
Mole enable	0x92C	1 if enabled, 0 else.
Mole size	0x930	08-00	Left button increases value.
Mole horiz pos	0x934	00-10
Mole vert pos	0x938	00-1E
Mii height	0x93C	00-7F
Mii weight	0x940	00-7F
Mii name	0x944-0x959	UTF-16	Terminated with 0x0000. Not updated immediatly?
Creator's name	0x95A-96F	UTF-16	Terminated with 0x0000. Not updated immediatly?
Mii gender	0x970	0: Male, 1: Female
Birthdate month	0x974	01-0C
Birthdate day	0x978	01-1F
Mii shirt color	0x97C	00-0B	Ordered like in editor.
Favorite	0x980	0: false, 1: true
Allow copy	0x981	0: false, 1: true
Unused byte?	0x982
Allow sharing	0x983	0: true, 1: false
???	0x984-0x98F	All zero?
???	0x990-0x997	4?

0x08815998: Same 4 bytes as encrypted Mii: first 4 bits for Mii type, 4 next for number of seconds since 01/01/2010 00:00:00 UTC+3 (should be verified by other country and region 3DS) divided by 2. 0x0881599C: 6 bytes of MAC address of the 3DS that created the Mii. 0x088159A2: 6 unknow uses bytes 0x088159A8: Same 8 bytes as decrypted Mii at 0x04 through 0x0B. Seems NAND specific, kept the same on Miis created on same NAND but different 3DS via System Transfer. Might be a coincidence but the two first bytes are in ID0 folder name in the Nintendo 3DS folder.

Mapped Editor <-> Hex values

Most of the values are ordered (left button decreases, right increases, color choices are top to bottom...) but for most "main" part of the UI, where you choose the style of the part being edited, hex values has no correlation with displayed order. Here is a JSON that can go from a Part, a Page and Position to the right hex value. This is 0 indexed (eg: datas["face"][0][11]).

{
face: [
    0x00,0x01,0x08,
    0x02,0x03,0x09,
    0x04,0x05,0x0a,
    0x06,0x07,0x0b
],
hairs: [
    [0x21,0x2f,0x28,
    0x25,0x20,0x6b,
    0x30,0x33,0x37,
    0x46,0x2c,0x42],
    [0x34,0x32,0x26,
    0x31,0x2b,0x1f,
    0x38,0x44,0x3e,
    0x73,0x4c,0x77],
    [0x40,0x51,0x74,
    0x79,0x16,0x3a,
    0x3c,0x57,0x7d,
    0x75,0x49,0x4b],
    [0x2a,0x59,0x39,
    0x36,0x50,0x22,
    0x17,0x56,0x58,
    0x76,0x27,0x24],
    [0x2d,0x43,0x3b,
    0x41,0x29,0x1e,
    0x0c,0x10,0x0a,
    0x52,0x80,0x81],
    [0x0e,0x5f,0x69,
    0x64,0x06,0x14,
    0x5d,0x66,0x1b,
    0x04,0x11,0x6e]
    [0x7b,0x08,0x6a,
    0x48,0x03,0x15,
    0x00,0x62,0x3f,
    0x5a,0x0b,0x78],
    [0x05,0x4a,0x6c,
    0x5e,0x7c,0x19,
    0x63,0x45,0x23,
    0x0d,0x7a,0x71],
    [0x35,0x18,0x55,
    0x53,0x47,0x83,
    0x60,0x65,0x1d,
    0x07,0x0f,0x70],
    [0x4f,0x01,0x6d,
    0x7f,0x5b,0x1a,
    0x3d,0x67,0x02,
    0x4d,0x12,0x5c],
    [0x54,0x09,0x13,
    0x82,0x61,0x68,
    0x2e,0x4e,0x1c,
    0x72,0x7e,0x6f]
],
eyebrows: [
    [0x06,0x00,0x0c,
    0x01,0x09,0x13,
    0x07,0x15,0x08,
    0x11,0x05,0x04],
    [0x0b,0x0a,0x02,
    0x03,0x0e,0x14,
    0x0f,0x0d,0x16,
    0x12,0x10,0x17]
],
nose: [
    [0x01,0x0a,0x02,
    0x03,0x06,0x00,
    0x05,0x04,0x08,
    0x09,0x07,0x0B],
    [0x0d,0x0e,0x0c,
    0x11,0x10,0x0f]
],
mouth: [
    [0x17,0x01,0x13,
    0x15,0x16,0x05,
    0x00,0x08,0x0a,
    0x10,0x06,0x0d],
    [0x07,0x09,0x02,
    0x11,0x03,0x04,
    0x0f,0x0b,0x14,
    0x12,0x0e,0x0c],
    [0x1b,0x1e,0x18,
    0x19,0x1d,0x1c,
    0x1a,0x23,0x1f,
    0x22,0x21,0x20]
]
}