1)without a single ounce of selfishness--- anirudhar,alwarkadiyan,kalanthakakandar,periya paluvettarayar,malayaman,kundavai,sundara chola,arun mozhi,sendan amuthan and sembian madevi,sendan amuthan
2)with a bit of selfishness----puthi vikramakesari
3)people who wanted to achieve their own means--vandiya devan,parthibendran,athitha karikalan.
4)people who served due to their love on individuals and not on country--mandakini,manimegalai,poongulali
5)Totally selfish ones--all sitrarasars like rettai kudai rajaliar,sambuvarayar etc.
my explanation for these group classifications.
All the people in the first group wanted chola empire to become the greatest empire in the world.They believed it can be achieved thru their own methods and played politics but none in this group ever let loose of this dream.Periya paluvettarayar was taken off track by nandhini who made him believe that her plans were for betterment of chola empire.But as he says at his death bed "He never did anything against chola emperor or the king".These people had this selfless dream in their mind.
Puthi vigramakesari too falls in the first group actually but he had a small selfishness in that dream.He wanted his daughter to marry arunmozhi and become the ruler of chola empire.So i created a new list for him even though he should have been in the first list.
vandiya devan wasnt even a chola.Initially he wantes to establish a independent vanar desam and keeps on talking about it but in end falls prey to kundvai and merges with cholas.Parthibendran wants to create pallava desam and dies in that process in end.Athitha karikalan was mad on war.He just wants an army to ransack and doesnt worry about who the king is.He is affected by nadnhini and is even ready to forego the empire for her.