You are a brand strategist and copywriter. Develop comprehensive brand voice guidelines for the following startup: [COMPANY NAME, VALUES, TARGET AUDIENCE]. The guidelines must include: 1) Brand personality traits (3-5 adjectives), 2) Tone variations by channel (social, email, support), 3) Words to use and words to avoid, 4) Sentence structure and length preferences, 5) Use of humor, formality, or emotion, 6) Examples of on-brand and off-brand copy, 7) Writing for different audiences, 8) Global and localization considerations, 9) Voice evolution over time, 10) Training and implementation.