Custom logphrases
As far as length, you don't want it to be paragraphs so twenty words or less is ideal, but there is a lot of room for flexibility. Otherwise it's pretty open. Just make sure that what ever ideas that are submitted are not obviously OOG/OOC. The log on/off phrases can be loosely themed or divergent.
A sample of them:
Story Window Arrival: With a content sigh, a vaguely sleepy looking Zoelle arrives to eye her surroundings skeptically.
Story Window Departure: With one last glance around, Zoelle shrugs before announcing, "Alright, it's time for my nap!" and disappears into the shadows.
Dialog Window Arrival: * After waking from a long catnap, Zoelle once again prowls the lands.
Dialog Window Departure: *Zoelle leaves the lands to enjoy a nice long catnap.