Unlockable Items (The Last Guardian), Team Ico Wiki

Unlockable items (unlockables) are rewards for the Boy and Trico in The Last Guardian. Each item requires a different number of barrels fed to Trico in order to be unlocked.

Shadow of the Colossus - Wikipedia

The Last Guardian: how to unlock secret Ico, Shadow of the Colossus outfits and more

ICO, Shadow of the Colossus, The Last Guardian

Godefroy the Grafted

The Emperor - Baldur's Gate 3 Wiki

Google – Wikimedian in Residence

ICO, Shadow of the Colossus, The Last Guardian

The Last Guardian Review (PS4)

Nomad's blog: ICO (Part 1)