hairlesswookiee
PALPATINE CRUSADER!!!!
I think what will ground Hal is the other GLs. Sinestro is a no-nonsense character more of a dictator oriented person, Killowog, Saalak, all very serious. From what I've seen they've made a point to keep out the lighter, funnier GLs and use the more militaristic and serious ones probably to make Hal standout but also probably to balance between humor and seriousness.
They are at least going for the Tony Stark formula where he is the comedian surrounded by straightmen feeding him lines.
This is the vibe I've felt since I found out that Reynolds was getting the part.