The faces that appear on your right VDU have independent helmet graphics with names on them. The helmets used in the cockpit are generic - you can find them in the file HELMET.V00. The text has to suit every pilot, so they went with something blurred. I agree that it looks like it started as "real" writing, and there's a good chance that the artist wrote some as an in-joke - like the "dipstick" used in the lip-synch whenever the player's name is mentioned.
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There are a few oddities in HELMET.V00. For starters, there's this bent helmet, that I don't believe appears anywhere. (Jazz's damaged Helmet from the SO2 ending is in HELMET.V20).
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There's also a special wide helmet for Hobbes. Despite this, it isn't quite wide enough for his mouth animation, with his whiskers occasionally flickering outside. While this could have said "HOBBES", they used a widened version of the blurred text from the human helmets.
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Then there's the special space suit that Angel wears for funerals.
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There are microphone graphics, which (sort of) fit on the portraits but aren't used anywhere in the game.
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Strangest of all, HELMET.V00 contains part of Shadow's and Spirit's hair. You would expect these to be stored with the rest of the face cels for both characters - PEOPLE.V11 (Shadow) and PEOPLE.V14 (Spirit). However, those files don't contain these parts of the hair, so the versions in HELMET.V00 probably are used by the game.
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