Conversation without scheduling
The appeal of companion chat online is simple: the conversation is available at the hour you are free, not the hour someone else is. That matters most for shift workers, for people living several time zones from their friends, and for anyone whose best thinking happens after midnight.
What it feels like in practice
A good session is unremarkable in the best way. You mention something small, the character asks about it, the thread wanders, and half an hour later the day has settled. It is closer to a phone call with a friend who is never in a hurry than to using a tool.
Choosing a voice
Pick by manner rather than by appearance. Direct and dry suits people who like being argued with; slow and warm suits people who want to be heard. On Happy Peaople each profile is written so you can predict the tone before you start.
Making it worth returning to
Continuity is the difference between a novelty and a habit. Go back to the same character, refer to last time, and let jokes and stories accumulate. Short and frequent beats long and rare.
Honest limits
Companion chat is company, not care. It does not replace friends, family or professional support, and a well-written character will say so when the subject calls for it. Kept in that place, it is a genuinely pleasant part of the day.