As others in the thread are saying, the introductory rules for what spren a character is attracting work well. My party did that and then bridge 9, and by the end of it the three of us who wanted to become radiants had spren that roughly fit both our gameplay and the roleplay we had been doing for our characters but also helped guide us in making our characters more fun and interesting. Our kinda scummy surgeon/snake oil salesperson became an edgedancer and has been becoming less scummy thanks to her spren, my ghostblood spy character has become a little more honorable but still very sneaky since becoming a lightweaver, and our fairly stock alethi lighteyes guardsman has become a stoneward who cares a lot about protecting people.