The Mermaid.js Helper (OMH) plugin for Obsidian enhances the usability of Mermaid.js flowcharts and graphs. It introduces various commands to streamline workflow, such as cleaning up Mermaid code by organizing variable declarations, applying regex patterns to Mermaid styles or classes, and creating files from a list of titles or sections. Additional features include copying global color groups to local graphs and converting lists into link formats. This plugin is ideal for users who frequently work with Mermaid.js diagrams and need efficient tools for managing and customizing their flowcharts and graphs within Obsidian.