OK, this is my attempt at a Japanese Translation. Yes, the text is left to right, but that's because it doesn't fit so well top to bottom
If anyone has any understanding of Japanese please tell me how this translation could be better. (I've only got JPN I and an online source for figuring out the "casual speak").
Here we go...

Advice is good (I mean, one speech bubble is entirely a Google translation )
I need any help I can get.

wow, i'm amazed O_o

YAY!!! Thank you for the criticism!

I've only read a few pages from the Naruto manga in Japanese, but you're right he used katakana for boku, so I'll try that out.
I don't know anything about watakushi, except that it is very formal and Zazu uses it in "I Just Can't Wait to be King"
I figured since Grape was playing as the emperor it might be appropriate (she starts with boku, but then goes for watakushi).
But I can use watashi if it's better.

I am aware of what each kanji means. I used google translator as a reference for a lot of the kanji (and quite a bit of the phrasing). Not the most reliable source, but I assume at least the vocab is all correct. Also I assume the kanji I used for the pun is fairly high level, but it was reeeeeeally hard to find a good (bad) pun. Reads "koutei no tenki wa haran desu", the pun being that the kanji used for tenki means outcome, but sounds like weather. "The emperor's weather is stormy." "The emperor's outcome is stormy." (BAD!)

Edit: Looking the kanji up, it appears the only high level kanji in that pun is emperor (which ironically I assumed was lower level). The rest are like grade 3 (and one grade 6, which is a bit higher).

Oh, OK, didn't know about kure (I'm only familiar with the polite form of conversation) : "keshitekure," will do.

Aww, I like right to left <-need a smiley for that
I don't think it'll fit going up and down, and I don't have the tools to re-draw speech bubbles, so... left to right it is...

Thank you again! This is a lot of work, but I'm kinda liking it. Editing now...

Edit:　(I didn't realize there were so many junior high level kanji in there. Gah! Now I don't know if I should leave them or find a way to get some hiragana in there.)
Posting current changes with some kanji changed to hiragana (see first post).

Why must you keep reminding me of how little I know?

OK, here's the next one (still going left to right). Also I'm trying to only use kanji that are taught before Jr. High (except pig)
Here it is (with profound apologies to the Kansai region).

I love your work! Keep it up!!!

Oh, that makes sense. Editing...
Thanks, Ebly!

Well, here's #3 (The mo has been fixed).

My bad, panel 2

Fixed!

OK, I finished 4-ban! =)

Wow! There is a whole lot of text in number 5!
I don't have any good drawing tools, so just pretend they wrote "bakuhatsu!" in marker
(This is the Imaginate! arc *nod nod*)

YAY! Best 4th panel translation EVER!

Glad you liked it! It's all esplody ^_^
#6
Edit: It still says SLAM ... yeah. Anyone know how to get GIMP to let you write stuff on an angle like that?

so far, I had to save the image, rotate it, write the new effect as if writing an horizontal line and then rotate the image back to normal.
Ack! ackackack!

Yeah, rotation doesn't work well in GIMP
On a side note:
Bino's name pops up in the next comic. How does everyone pronounce it: Bye-no or Bee-no?

Ask Rick in PM. I have always pronunced Bee-no...

Same here.

Where are these?

I still can't imagine pronouncing it BYE-no....

my bad. In italy, Fido and Bino are pronounced Fee-do and Bee-no.

Same thing in France.

I also say it that way, sounds better also, so I will just imagine it is Bee-no and Fee-though.

OK, if Rick says it's BYE-NO, Baino it is
Here's the next panel
Edit: And cause I've been lazy for a few days here's another ^^

This translation looks awesome, but unfortunately I don't know Japanese.

Well, from what I know, in some mangas like Naruto or Death Note, the strips is left to right. So I decided to remake the strips to looks like manga pages (or near to it. ), but to finish it I gonna need a .txt file with every text from the translated strips.

Here a preview from how it gonna looks like.

Wait, is that all really necessary? I like manga as much as the next culturally-savvy guy, but it seems like that's an unneeded step for a translation project.

何ですか？あなたは何を意味するのですか？

That, my dear friend, is laughing.

This leads me to believe you looked up your phraseology on Google.