The Guild is essential to long term success in the game. With this, research will take a little less time. Once it is built, players can put up to 3 characters into each Guild that they have. Each character added means research moves a little faster. That is the basics. But there is much more that needs to be considered.
When characters are placed in the Guild they cannot be removed. They are there for life. Make sure that you have enough characters available to keep your vanguard up should they die in combat or old age. Vanguard is more important. So who goes in?
While having people in with higher intuition is great (intuition is what gives the research credit), this is the perfect time to put in the characters that offer no real benefit as a regent/partner or in your vanguard. Put your worst characters in here. Clumsy Hunter, Puny Caberjack, Dimwitted Alchemist, and those that really can't be put into a better posting. In other words, those suited for government work.