All of these are subjective, of course.
1. "I'm going to run a few training threads to boost my Observation skill."
2. "Even though it only pays 2gm/day, I chose the Labourer occupation for my new character, because it fits the story I plan to tell."
3. "I don't plan on acquiring a gnosis for my character."
4. "I run job threads early in the season, just because I love them so much. Also, the 2k word minimum excites me and encourages me to push past my limits."
5. "I don't think I'll need any placeholders for this season."
6. "I've been playing for two years and I still haven't mastered Socialization."
7. "Instead of waiting for the grader to assign me overgiving penalties, I'm just going to afflict my character with them in-thread."
8. "I'm going to give my new character Leeching as a starting skill."
9. "You know what, I have so much time on my hands, I'm going to create another alt."
9a. "I've got lots of free time to write solos for my character."
9b. "I've got free time."
10. "I'm going to start my new character in a domain without a storyteller or players, just because I like the location."
11. "I'm going to write a thread wherein my character breaks one of the laws of the city, just because I want to role-play the consequences."
12. "Man, I wish there were more legendary artifacts / monsters / locations in the game... I'm going to start a new topic in the Lore Discussion forum to gauge people's interest in my ideas!"
13. "The Syliran Knights are overrated."
14. "I really enjoy playing a Ravok character that's devoted to Rhysol and loyal to the Ebonstryfe."
15. "I'm going to play an Akalak in Riverfall."
16. "I think the grader actually awarded me more experience points than I deserved in the thread. I'm going to PM them to correct this problem."
17. "I'm going to play a character in a city with a sizeable player organization and not try to join said organization. Too much social activity for me."
And, finally, for the storytellers:
18. "What's this? An ST posted an intervention in my thread / CS? Well, I guess I'll go comply with their request."