Well, the same thing you said about the lightning... that applies for herobrine. Im not really interested in 'Herobrine Hunting' myself but, herobrine is just the default skin but with white eyes, so minecraft could just use the char.png and shade the eyes white and BAM herobrine. Like lightning doesn't have a texture and it just uses a white shader, so might herobrine. And even if you can't find the file for it, you can't find the file for bedrock and even if you can its a different name than the regular blocks so herobrine might be an entity but the name is different, so yeah. Proof FOR him