I'll um.. correct the spelling and grammar as best I can while still making it sound like you wrote it. ._.; I'll notate my thoughts in parenthesis ( ).
"You forgot this little girl. Maybe I should keep it? It could make a nice lamp." (did you mean, lamp shade?)
"Hey you! Give me back my red hat! It's MINE!!!!" (Not sure if you meant to say Red Mage hat or just red hat, but either way I think your message is understood.)
"This time it's PERSONAL!"
"...And stop tickling me with the feather of my hat from the (?? I don't really know what that says) panel above! Why did the stupid artist put it there.."
"HO! (Ho?

?) That old man looks so nice and polite. Try not to hurt him too much, it might cause him a lot of pain in the morning. (Kind of hard to interpret just what you meant, I think I got it close) Be nice with him, okay?" (Might sound better with "Be gentle with him, okay?")
"I'll teach that old man to never take a Red Mage's hat! This time I won't be nice."
(alternatively you could say something like "I'll show that old man! He'll never want to take a Red Mage's hat again! This time I won't go easy on him.." which gets across the same kind of message I think you were aiming for, granted it's also a little more wordy.)