Well, for a personal one, Ranma hugging everyone he's had issues with, such as Kuno, Ryoga, Mousse, that dorky French guy, the horny figureskater, all of 'em! - Ooh, or gobs of his fiancees; 8 Akanes, 7 Shampoos, 11 Ukyos, and one Kodachi, 'cause someone would say, "Hey, why isn't she mentioned?" even though she was never really declared his fiancee.
Ooh, how about the Transformers? Both sides, with Optimus Prime & Megatron in the middle?
How about every Street Fighter & SNK character ever, all in one giant hug?