its very doable via css.. just make a class for it and apply whenever you need class="myclass" i dont think you really need a plugin for this..

edit: were you talking about the

Contents
[hide]

    * 1 Background
    * 2 Personality
    * 3 Family, Friends, & Enemies
          o 3.1 Family
          o 3.2 Allies
          o 3.3 Others
    * 4 Recent Events
    * 5 Trivia
    * 6 Links
    * 7 Soundtrack

box

or the uuh.. the one at the right starting with 'racine' .. no matter which you meant they are both doable

Named Racine, thank you!

and where were you ideally planning to use it.. inside of a post, or in sidebar or what else..

nvm.. take a look at [url=http://www.tilqi.com/wikinfo.html]this[/url]

all you have to do is place the css codes and set a width you wish for div #infobox only once

the routines:
1.place <div id="infobox"> before entering the content
2.use <h2>sometitle</h2> whenever u need to use those blue titles
place your content and close the </div>

2 steps doesnt take that long huh :P

css

<style type="text/css">

#infobox {
width: 280px;}

#infobox h2 {
display: block;
background-color: #8393CA;
color: #FFFFFF;
font-weight: bold;
font-size: 16px;
}

#infobox img {
width: 100%;}


</style>