A typical DBZ stereotype that you find in most shounen manga. Though I mean this as in any terms so that this would broaden to all genres. This could include burst and powerful change in personality/mental change/intelligence. Basically along the lines of getting powerful when most needed/wanted.

To specifically drop it to some manga and not all shounen's. The main protagonist is a male, and when he does transform/go dbz mode, he looks cool or changes in looks. Any plus points would be romance/adventure/comedy/action/shounen/sienen

Also please no yaoi/shojo (maybe if male lead)/yuri/smut.

Also recommend manga that you would only read.

TY

That's easy. Bleach

[color=green]Life, what would it be without so much wrongs and rights?
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[color=red]Star Trek XI http://www.youtube.com/watch?v=rZiR-NETDr0[/color]

Flame of Recca - Covers everything you ask for (ok the main char doesnt "transform" just has flames popping out of his arm, good enough)

666Satan - Doesn't fit as perfectly as flame of recca or bleach, but still close enough, and I think you might enjoy this

Also I second Bleach

I guess there are others like Change Guy but those ticked me off so much in how unorigonal and silly they got that I couldnt even finish reading them (also there are no supernatural powers)

Double dino to micro crimp!!!

One Piece by far. It has the Dragon Ball vib and sprite (and thats probably why it has been soooo huge in Japan, and has even surpassed Dragon Ball in sales and such).

I also found that 666Satan (aka O-Parts Hunter) had a rather Toriyama feel too it aswell (more so then Naruto does).

DNA^2 - Not really as action-oriented as most that are listed but the lead's transformation is an exact duplicate of SSJ.

Kami to Sengoku Seitokai - Guy grows a wolf tail and swings a chain around.

Monster Soul - Another Wolf guy. Goes along the some veins as One Piece and Fairy Tail.

LOOK AT MY WITTY SIG!!11!!!!11

bleach is a given.

katekyo hitman reborn is another thats good