That rocket jump best be the most awesometacular Up B in the game regarding recovery ability. The meteor smash it delivers should be like Ganon's bloody D-air as well in terms of potency, since if anyone is dumb enough t' try and spike with it the payoff of a successful hit should be huge. In regards t' that, knockback from the initial blast should be diagonal/horizontal and heavy if hitting a foe while grounded at the start of the move.
After three-stockin' someone, TF2 crowd should get the domination jingle and an appropriate audio-only taunt t' insult the character they just owned. Scout needs t' tell Sonic that's he's too slow.
When playin' a team mode with another TF2 character on your team, taunting at the same time should cancel both players' taunts into a high five.