When I use Oranguru's "Primate Acting" attack and I realize I don't want to use any of the Supporter cards in my opponent's discard pile, can I choose not to use any?
No, you cannot. If you use the attack, you must choose a Supporter card if there are any in the discard pile.
Source: TPCi Rules Team (2023-01-19)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH125_119
SWSH125_119