Shortly after my son was born I started calling him "Buddy." I love it and he answers to it like a name now. My daughter is two and she calls him Buddy, which I think is the most adorable thing ever.

I'd like to do this with my daughter, but I'm not really a fan of things like "honey" or "sweetheart," though I do wind up calling her sweetheart pretty frequently.

Buddy is like friend, which is what I'm going for, but that's taken already. What else could I use?

A series of gender neutral alternatives for the third person singular pronouns (he/she/it) have been proposed throughout the recent years (and maybe decades). I wonder the preferences of fellow users here in that regard. So I'd be glad if you could answer the questions in the title, and maybe elaborate a bit on the reasons of your preference. I'm both interested in this generally, and it could be useful as a means to help me practice quantitative linguistic variation (obviously this would hardly be scientifically usable source of data for actual real research so I'm not asking this for that purposes). I'll add my preference as a comment.