User blog comment:Sannse/I Want to Be an Admin/@comment-5448890-20140514210210

On Monster Hunter Fanon (my home Wiki, which I primarily run along with another administrator, Setheo), the adminship is granted periodically, based on the activity level, userbase size, and available users of that time. If an admin goes inactive, they're taken off the roster and a new one is chosen from a small imaginary list that Setheo and I agree upon. After the admins of the wiki agree, the admin is chosen and he is given a talk page message alerting him of the change. However, some admins may be chosen for very specific reasons, such as needed changes or if they're particularly good at editing.

We also have nomination rules set up on our Policies page, and we have a select maximum number of admins at any given time.