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That is correct. Extended hexadecimal beyond F (which is level 15). I recently read an adventure that had aliens with a characteristic of 20, so it does exist in MgT 2E, just not very common. I also believe augments can take a player characteristic above 15.
Characteristic not Skill
(also see Moonracer above :) )
However since you skip I and O, K is only 19 and L would be 20
Mechanically, the system can take any value and the bonuses calculate dynamically. The UPP is not correct for values above 15, but its cosmetic only. The UPP display only affects NPC records and you would like to see the correct hex value for values over 15 correct?