ProblemAsking for a tone by adjective produces a generic imitation of it.
TechniqueHave the Bot read your sent mail and recent chat messages and derive a style profile: sentence length distribution, openings and closings by relationship type, constructions you actually use, a never list, and three verbatim examples of you at your best. Save it to a file and have every writing Bot load it.
Why it worksIt derives the pattern from evidence rather than from your description of yourself, which is usually wrong.
When to useBefore any outbound, support or content Bot writes in your name.
When not toWhere mail cannot be connected, paste twenty to thirty real replies and write the never list yourself.