Gongcheng Yuandu felt that the Nackle Alien would make a quite good bodyguard. Just think about it: no matter how powerful the bodyguards his old man found for their Third Brother were, they were still ultimately human; the Nackle Alien was different.
As an alien, his physical constitution was superior to that of ordinary humans, ordinary firearms were unlikely to kill him outright, and he could even grow to giant size...
When someone as strong as Tsukasa Kadoya or other monsters appeared, the Nackle Alien would at least have a chance to stall for time until he himself arrived at the scene.
Chapter 138