Redid the thread to omit some redundancies (and stuff that's already been added!)
Badge Ideas (I know some of the names are taken already, I just kept them analogous to the PM/TTYD names):
Item Hog Increases item drop probabilities by 20-30% (possibly excluding Cards)
Pity Flower Adds a STACHE/2 chance of restoring 1 FP every time you take a hit.
(Would make a good Flower analogue to Heal Power.)
Chill Out Disables enemy First Strikes, although still allowing them to remain aggressive.
Runaway Pay Restores 25% of HP/FP lost in battle upon running away.
(Could use the Return Postage sprite from PMTTYD)
Heavy Hitter Increases damage dealt by 40%, but doubles attack delay.
Feather Weight Decreases damage dealt by 40%, but halves attack delay.
Other ideas:
A random card envelope that costs 500 coins and has a chance of containing any non-minigame/special card in the game.
A soda shop run by Chet Rippo or such that allows one to spend 390 coins (as a PM reference) for a drink that allows you to subtract one point from ATK, DEF, SPEED, or STACHE, and add it to another of the four. Obviously, you couldn't use one to make any stat fall below 0. I feel this would be especially helpful now, as the new update completely changed the effectiveness of a number of already maxed or near-maxed accounts.
Passive Speed/Stache-buffing specials that increase effects slightly (0.4 -> 0.6 crit/block chance, 3ms -> 5ms attack-delay reduction, 1% -> 1.25% shop discount per point)
Card prices could stand to be revamped, as they help too much in the early-game and not enough in the late-game; perhaps they could sell for 10*(Enemy Level) coins or 1*(Enemy Level) Beanbean Coins, with the bosses selling for about double the price of the most expensive normal-enemy card in the area.
Perhaps every month or so, another HnS map could be added, as a few players more than likely have figured out all of the hiding spots in the current map. Some likely good places to model would be the Mushroom Plains area, the Mushroom Kingdom Path, and the Mushroom Kingdom itself.
Some old sprites: