Put it at the start of a character introduction, right as Ara comes into view, then follow it with Okay Let's Go to move into the match, or use Ara Ara afterwards for a second greeting from the same character.
About this sound
This is a short three-second voice line from Ara, the Elsword character, saying 'Ai ia!' It feels cheerful and playful, like a quick greeting that catches attention without sounding serious. The clip comes from the North American version of Elsword, where Ara delivers the line as one of her in-game vocal reactions.