Imperious
Without the sun of my life
Well, since Otto is the father of our best/only friend and future girlfriend, we should worry about his safety...
And you know Ser Harrold Westerling is part of Otto's taskforce, I would prefer for him to survive
In and out of itself Otto's death seems like it'd be doing us a solid. Guy is likely to develop into a huge pain up our bum. I'm more concerned about how Viserys might react to his death.