Happy Heart

Happy Heart is a badge in the Paper Mario series.

Paper Mario
In Paper Mario, there are actually two Happy Heart badges. The first of these badges is found in Merlow's inventory. He will trade this badge to Mario for 8 Star Pieces. Another is found in Raphael the Raven's giant tree. When Mario is climbing the tree from the outside, he can by-pass the door and keep going up. At the top of this large vine is this badge. This badge costs 3 BP to wear and is somewhat helpful in battle. This badge, once every so often, will give Mario a heart during battle. With multiple Happy Heart badges equipped, Mario can gain HP at a much faster rate.

Paper Mario: The Thousand-Year Door
In TTYD, Happy Heart makes a reappearance. In this game, too, Happy Heart has another copy. With this badge, Mario can gain HP in the same fashion as he could in the last game. Also, Happy Heart increases this rate when another Happy Heart badge is equipped. To wear a Happy Heart badge in this game, Mario must pay 2 BP. Elsewise, this badge is pretty much the same as it is in the last game. This is also one of the many badges with a partner version.