I wouldn’t rely on UGameplayStatics::GetPlayerCharacter(0).
If you want to make sure it is the exact character, pass a reference of that Character into the Actor and then check against OtherActor.
Or, if you simply want to see if Other actor is a Character, you could do:
ACharacter *OtherCharacter = Cast<ACharacter>(OtherActor);
if(OtherCharacter)
{
// Your code here...
}