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Hobo Duck plants a single rose and then jumps off the screen. The rose grows taller until it hits the top of the screen. Then a bunch of giant thorns shoot out from the stem, causing major damage to anyone it hits.

A Name Not Taken throws his ninja star and it multiplies into 5 ninja stars total. The stars then fly around the stage randomly for 30 seconds.

Another opition, Sticky feet turns into Super Sticky Feet. His persona's figure jump, attack, speed, defense is multiplyed by two. He then massacres everyone on screen for one drastically long minute.

Sorry, but I've never even heard of "Power Stone".
Just a weird coincidence I guess...
(ignore me, too)

Ignore me as well, but I'll explain what Ayame does in Power Stone, there's actually two things and I'm not quite sure which one A Name Not Taken was really looking for.

One - She jumps up in the air and for a few seconds continuously shoots out pink, but powerful, arrows at the opponent, they aim automatically. I found a video with her using it as well as one for the next attack I'm explaining, so I'll show you that. Skip to 0:38 and Ayame is the one with a green arrow on top of her head and a "3P." Watch when she shoots out arrows and that's what I'm talking about here. Vid

Two - She stays on the ground, but sends out some sort of weapons. The look almost like a Naruto Kunai, if you know what that is. They also aim for you, and they... well, it's hard to explain. I'll just skip to the video that I found, go straight to 1:15 and pause, look for the player with 2P (again with a green arrow) on top of it, that's Ayame and look at what she does (You'll know when she does it since you'll see pink all over the screen) And here it is

And it isn't a weird coincidence to not know what Power Stone is, it's on Sega Dreamcast which definitely is not a popular system at all. Personally I enjoy the Dreamcast, but that's just me.

Kite stonewaters robot grows huge and starts shooting lazers and steps on people. does major damage.

The Hobo Duck evolves into Hobo Duck of DOOM! He flies around the stage poking people with his lightsaber, doing major damage.