Lore about Childhood Past XML:

He would never do hurt anyone due to he did run pacifist route in underground on undertale. He was being nice to monsters because he always being nice

Lore about Childhood Past Run.XML:

He just appeared in Childhood Past XML's mind by his friend call "Keith" to him too many, that caused Childhood Past XML goes on Run Mode. He aggressively toward to his friend, he allow to use his power to summon spikes but only one spike to attack ppl