Odell/Owen was the engineer on the Hyperborea/Borealis.
Odell was one of the first real characters developed for Half-Life 2, being created in 1999. His role was seemingly to act as a 'leader' AI, guiding the player through the Hyperborea/Borealis.
Odell is unique to other cut characters, as he had a lot of temporary dialogue (voiced by Marc Laidlaw) created throughout Half-Life 2's development.
This era of Odell's character has his voicelines stored in sound/odell, rather than sound/vo. This correlates with HL1-era directory handling, signalling the voice line's age.
|odelltest 1-8 are just cut up versions of odelltest.wav, presumably to make lipsync easier.|
|striker.wav||(non-quote)||Seemingly for a weapon Odell would wield.|
All these sound effects are dated November 16th, 1999.
Something interesting to note is that all of these lines, with the exclusion of the full odelltest.wav, have lipsync. This makes it likely that the focus on facial technology started extremely early in Half-Life 2's development.
By the time Half-Life 2 leaked, the Borealis had already been cut, and his character model had been thrown into limbo. As such, his model was left unattained, and in the Leak his textures are completely scrambled. However, his face eventually found a home with the Oddessa Cubbage character in the Coast chapters of the retail game, with some modifications to his face texture and attire.