What does this symbol "I" mean in a manga? What is its usage?


I saw in a manga **ミIナト** meaning _minato_ a name but I don't know what the
character between **ミ** and **ナ** means and the usage of it

and theres another one too **おまさてI** and theres like 3 lines below it's
written downwards

I'm not sure if its a mi katakana or what[![enter image description
here](https://i.stack.imgur.com/vW5NU.jpg)](https://i.stack.imgur.com/vW5NU.jpg)

and what does that **S** like symbol mean? [![enter image description
here](https://i.stack.imgur.com/5ZHKe.jpg)](https://i.stack.imgur.com/5ZHKe.jpg)




  * This vertical bar is a long vowel marker written vertically. Here, it just indicates "Minato" is pronounced with some accent. In English it would be "Mii-nato!" or something. Maybe the speaker said "Minato" slowly and loudly to draw attention, or maybe the speaker is not a native Japanese speaker. You can see the same symbol after おまたせ.
  * These S-like symbols are "wave dashes". They are usually used in place of long vowel markers in manga, light novels, etc (See [What is the difference between the wave dash 〜 and long vowel marker ー when marking long vowels?](https://japanese.stackexchange.com/q/11660/5010)). However in this context, they are probably used in place of ellipsis (`･･･`) used to indicate the speaker is at a loss of words.
  * By the way, this `っ` is another way of indicating the speaker cannot say something. See: [What does ending a statement with 「っ」signify when coupled with 「・・・」?](https://japanese.stackexchange.com/q/5867/5010) and [What does the little っ (tsu) signify when at the end of a word?](https://japanese.stackexchange.com/q/1457/5010)

