If bungie add more emotes in, it would be good to have class specific ones to differentiate the classes or subclasses more, for example, a gunslinger could taunt by spinning the golden gun on his finger, warlocks could have a ball of magic I'm their palm, blade dancers could do knife tricks like balancing a knife on their finger or something. Just to add a bit more character to the classes/subclasses
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Since warlocks are more intellectual and the way they study magic, maybe they can just facepalm or something as if they are witnessing complete stupidity, idk. I think it would be better if they let us choose from a few different ones when we are making our guardians