H3 Cast Board

H3 Cast Board — the reference cast, uploaded into the node itself. Roles decide tags, not file order. The H3 guide is explicit that a character, product or style image is NOT automatically a <Picture N>: if it only supplies reusable identity it is a <Subject N>, and <Picture N> is reserved for a concrete first/last/key/edited frame or composition anchor. The four kinds are numbered independently, so <Subject 1> and <Picture 1> can be different assets. Numbering follows card order within each kind, so reordering the board renumbers the tags — and the wired IMAGE outputs move with them, which is what keeps the tags in a prompt pointing at the slot they were written for. The three reference inputs grow on their own: connect ref_image_0 and ref_image_1 appears. That is ComfyUI's own Autogrow, the same mechanism the MiniMax H3 sampler uses for its ref_image_ / ref_video_ / ref_audio_ families, so the two nodes behave identically. Outputs cannot do the same: an output link is bound to a slot INDEX, so a node that adds or hides output slots silently repoints every connection downstream of it. They are a fixed set instead.