My first suggestion is to stop using terms like "add to us" when describing what you're looking for. It'll rub a lot of people up the wrong way for reasons that will become clear as you read up on Unicorn Hunters.
Secondly, read up on Unicorn Hunters. You may not feel you fit the mould, but unless you do something to differentiate yourself from them then that's what you will be assumed to be, particularly while you use "add to our relationship"-type language.
Thirdly, meet people and get to know them. If you get along then try to work out what shape a relationship with them might take. Don't go out with a triad-shaped hole to fill and try to force people into it.
There's plenty more good advice out there. The best thing you can do is read as much of it as you can and try to take it on board even—or perhaps particularly—when it's not what you want to hear.
Welcome, and good luck.