Here's how to Use Text Styles and Special Characters in YouTube and G+ comments.

You can copy and paste these into a comment:

☁☂☃☄★☆☇☈☉☊☋☌☍☎☏☐☑☒☓☔☕☖☗☘☙☚☛☜☝☞☟☠☡☢☣☤☥☦☧☨☩☪☫☬☭☮☯☰☱☲☳☴☵☶☷☸ ☹ ☺ ☻☼☽☾☿♀♁♂♃♄♅♆♇♈♉♊♋♌♍♎♏♐♑♒♓♔♕♖♗♘
♙♚♛♜♝♞♟♠♡♢♣♤♥♦♧♨♩ ♪♫♬♭♮♯♰♱♲♳♴♵♶♷♸♹♺♻♼♽♾♿⚀⚁⚂⚃⚄⚅⚆⚇⚈⚉⚊⚋⚌⚍⚎⚏⚐⚑⚒⚓⚔⚕⚖⚗⚘⚙⚚⚛

If I wanted to make some bold text in a comment, I would just put asterisks around it, *like this.* 

For italics, enclose between underscores, _like this_

And for strikethrough text, it's dashes, - like this.
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