G5 is actually kinda creepy now that i think about it.
Luffy is clearly still serious about his intentions and situations, just look at the panel where he spoke Pedro's name or even in this chapter right before he punches Saturn.
But G5 will literally just force him to smile and laugh through it all, as if the will of Nika/Joyboy was overwritting his own.
I hope later mastery over his awakening allows him to control his emotions more.