Making AI companions is becoming a widespread little hobby project. Many have created them and shared instructions on how to do it. My preference would be to use local resources only (say, with ollama), they can even be made with voice recognition, TTS, and an avatar character.

While I have not interfaced my AI with all the services that Clawdbot does (WhatsApp, Slack, etc.) I don't think that is too much of a stretch from my very simple build.