I could see a Goblin as a unique origin character, less as custom character race - as custom characters are to hail from Baldur's Gate, and from my poor understanding of DnD lore, that seems like an unlikely place for a goblin to be from.
Personally, I found "hide face" mechnaics in D:OS2 rather underwhelming. Cool detail, but too easily made irrelevant unless ones makes effort to not wear items. Face-changing mask was neat though.