These are the working letters for name mods.

99-
A1-
BA-
BF-
C0-
C1-
C4-
C7-
C8-
C9-
CA-
CB-
CC-
CD-
CE-
CF-
D0-
D1-
D2-
D3-
D4-
D8-
D9-
DA-
DB-
DC-
DF-
E0-
E1-
E2-
E4-
E7-
E8-
E9-
EA-
EB-
EC-
ED-
EE-
EF-
F1-
F2-
F3-
F4-
F6-
F9-
FA-
FB-
FC-
18-Red Arrow
19-Blue Arrow
09-X Button