I was playing around with my hex editor, and found the address for their initial data inside FF7.exe. So I thought I'd share the info with everyone.
Cait Sith's is at offset 0x520c10, while Vincent's is at offset 0x520c94.
If you want to edit them (to alter their starting stats, equipment, materia, ...), you can use the
Wiki Savemap, "Table 2 : Character Record" section.
Some addresses :
Cait Sith's Level : 0x520c11 (1 byte)
Cait Sith's CurrentHP : 0x520c3c (2 bytes)
Cait Sith's Base HP : 0x520c3e (2 bytes)
Cait Sith's Current MP : 0x520c40 (2 bytes)
Cait Sith's Base MP : 0x520c42 (2 bytes)
Cait Sith's stats* : 0x520c12 (1 byte each)
Cait Sith's weapon : 0x520c2c (1 byte)
Cait Sith's armor : 0x520c2d (1 byte)
Cait Sith's accessory : 0x520c2e (1 byte)
Materia on his weapon : 0x520c50 (4 bytes for each materia slot - first byte is the materia ID, and the next 3 bytes are its AP)
Materia on his armor : 0x520c70
Vincent's Level : 0x520c95 (1 byte)
Vincent's CurrentHP : 0x520cc0 (2 bytes)
Vincent's Base HP : 0x520cc2 (2 bytes)
Vincent's Current MP : 0x520cc4 (2 bytes)
Vincent's Base MP : 0x520cc6 (2 bytes)
Vincent's stats* : 0x520c96 (1 byte each)
Vincent's weapon : 0x520cb0 (1 byte)
Vincent's armor : 0x520cb1 (1 byte)
Vincent's accessory : 0x520cb2 (1 byte)
Materia on his weapon : 0x520cd4 (4 bytes for each materia slot - first byte is the materia ID, and the next 3 bytes are its AP)
Materia on his armor : 0x520cf4
* Stats are listed in this order : strength, vitality, magic, spirit, dexterity, luck.
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I'm glad to finally be able to change their starting equipment ^^ (to find the right value, you can check out the equipment's ID in Wall Market, and convert it to hex)
On a related note, it would be nice if the next Wall Market could load those addresses in FF7.exe. Beats having to use a hex editor