Ah yes. Two of the main Digimon, their Adult-Champion forms. Hoshiryumon the holy dragon beast, and Caedramon, the demon dragon P=
Weirdly enough, they are in the same team and ended up as being good friends, although it was... difficult. These two, however, are "the Hero and the Lancer" of the main group of kids and their Digimon.
Shiryumon is a holy Digimon, created to protect the Digital World long ago. Even as Hoshiryumon, he still retains his sense of humor and is very kind and caring.
Caedramon - he's the Champion form of Impmon, and he's basically everything Impmon was not - he becomes very serious and a lot more mature and aggressive than his Rookie form, and speaks rarely.
They first evolved almost at the same time - when Impmon first evolved into Caedramon, he showed his true nature - Caedramon didn't recognize his own human Partner and nearly killed the kid, and went on a rampage, while others were unable to stop him. That is until Shiryumon evolved into Hoshiryumon and was able to stop the undead monstrosity and weaken him enough so he de-digivolved back to Impmon.
Caedramon, Hoshiryumon (c) me
Digimon (c) Bandai