Can you recommend me some manga where the character suddenly turn in to Chibi when somethi...

You must read Vampire and Hunter!!!
http://www.now-do.com/task/view/6374997346036482505/en
In this chapter, when the hunter was so unwilling to turn in the weapons and the vampire was so scared of the holy water..they turned in Chibi.
I can't stop laughing xDDDD

http://www.mangago.zone/read-manga/kijima_kun/mf/tr_chapter-32/pg-1/

Manga: kijima-kun
Then, how about this one? I am just helping .ha..ha..ha
The drawing is quite good. At first you dont feel like to read it but if you keep read it, the story kinda getting more interested as the main character suddenly turned into chibi like baby face. Please dont mind with my english language. I am sorry cause my english language is kinda rusty and I dont know how to translate it. Ok ╮(￣▽￣)╭

So in conclusion i recommend you to read kijima-kun

What's chibi?

what genre is your preference for,,,if it's bl you could try blood bank as example, if it's shonen try black haze (●'◡'●)ﾉ

a Japanese slang word meaning "short person" or "small person". It can be translated as "little" or rather cute. (*3*)

by wikipedia.

Thanku all.of you giys do you have some other recommendations because i have already read the one you told me to.but thanku for your kind help (づ￣ ³￣)づ really thanku

Thank you

ur welcome,.. (,/^-^),/

I have a list of stories where they sometimes are shown in chibi style. not quite what you are looking for but I hope it helps http://www.mangago.zone/home/mangalist/168323/