Attributes have been added for color options. List of supported attributes:

• "*": bold
• "!": reverse
• "_": underline

Attributes are optional and can be added before color name/number/alias.

For self nick as white underlined:

/set weechat.color.chat_nick_self _white

For time in status bar as orange underlined with bold:

/set weechat.color.status_time *_214