culture - What are the stereotypical qualities of a gaijin trying to speak/write Japanese to a Japanese person?

There are plenty of stereotypical qualities of a Japanese speaking person trying to speak English, so, would I be correct in assuming the reverse is also the case, and if so, what would the most notable features be?

I ask this both out of curiosity and on the off chance I ever need to actually try communicating with people in a way that doesn't result in my casual humiliation.

Answer

I'm not sure if this is within the scope of your question, but the following is about highly stereotyped traits of "gaijin-speech" found in manga and net forums. They are explained in pages like this, this and this. Please note that they do not reflect how foreigners speak Japanese in reality. Unsurprisingly, some of them are rude or displeasing especially to the users of each language.

Western speakers trying to speak Japanese:

• Wrong intonation, accent, vowel length, double consonant: ニホーンゴワーカリマセーン, オモシローイデース, ビクーリデス


• Trilled/rolled ラリルレロ sounds


• Overuse of personal pronouns: ワターシ, アナータハー


• Unconditional sentence-end です: 見るデス, 行けデス


• Overuse/misuse of sentence-end ナ, ヨ, etc: 本当ヨ!


• Use of katakanized English when excited: オーノー! ワーオ! ホワット!?


• Use of ミー and ユー as person pronouns: ユーは何しに日本へ?

Chinese speakers trying to speak Japanese:

• 
  

  アル, ネー or ヨー at the end of every sentence: 私は中国人アル
  _{(This is based on a pidgin Japanese language but later established as role language. アル was rather common 30 years ago or so, but today it's usually a rude way to simulate Chinese accent.)}

  
  


• 
  

  Insertion of の between a verb and こと, とき, etc: 食べるのこと, 見るのとき

  
  

Korean speaker trying to speak Japanese:

• ニダ (Korean copula similar to Japanese です) at the end of every sentence: 私は韓国人ニダ
  _{(This is almost always rude.)}