I don't even main a Warlock but I think it would be pretty cool. Just a thought...
Floating would just show off their extra space magic-ness!
I suggest legendary/exotic sitting emotes that are class specific. Warlocks: floating in a double lotus pose. Hunters: power lounging in a lounge chair. Titans (the noble constant): sitting in an angular throne-like chair.
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You people are literally just asking for the meditate emote in warframe.