※Spoilers Below※
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Appearance Conditions
If Garry's blue rose has been stolen, and you choose to return to the real world after looking at the giant painting after taking a certain action...
(If you try to escape without having done so, you'll go straight to one of the endings without anyone calling you back.
Aside from the appearance of the fake Garry, there is no real difference from the other ending switch for Ib All Alone.
Because there are no official details on the fake Garry, his personality and such tends to differ based on the artist drawing him.