When Ahri Inquisitive's effect triggers on Daring Poro, am I forced to give the -3 might and forced to pay the deflect cost?

Ruling: No, you are not forced to pay the deflect cost on triggered abilities. You can decline to pay the deflect cost when the trigger finalizes, which removes it from the chain as if it never happened.

Sequence:

• Ahri's trigger goes onto the chain as pending
• When the trigger finalizes and costs are paid, you can choose whether to pay the deflect cost
• If you decline to pay deflect, the trigger is removed from the chain as if it never happened

Nuances:

• This only applies to triggered abilities, not other ability types
• Even if the Poro wasn't alone, you could still target it and decline the deflect cost