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I feel like the legends of their douchiness are exaggerations.
Koko saves you from the fall, and he fights off the Ultra Beasts. He loves battles, but that doesn't mean he doesn't also care about others.
Lele seems more mischievous and naive than anything. She sees people as playthings and servants, but struggles to comprehend them as much more than that.
Bulu did cause shit, but it also stopped Nanu's predecessor and the original Team Skull. He also wants to protect his land, which could be seen as him keeping balance between nature and advancement.
Fini just seems cold and untrusting. You need to prove yourself to her.