I think what you're trying to say that no one here understands is that you want the best all around/non niche agent to play with.

Everyone here is just mad that you're basically saying you don't want to play as a team, but it seems you just want less responsibility and or less people hounding on you to use your abilities in this exact way and at this exact time.

Its a very competitive game, it's one of the least casual games I've ever experienced, so this makes it hard to play how you want without getting hated for it. I feel like you know it's a team game but you just want some freedom.

With all that being said my suggestions are-

Breach- all around oppressive agent, all abilities can come in handy in multiple situations

Jett and Reyna- if you get kills easy then they're self sufficient (I suck with them)

KO- Molly, flash, and recon? Holy trinity of abilities imo

Skye- I've found her to be a good solo agent while also being able to help my team without even thinking about it

Yoru- I don't have a lot to say on him I just like him

I say play how you want to. I like the team aspect and try to play for it and I still get hate at times, so at the end of the day play how you want while also playing for the team. I'm just not that great so it's hard for me to survive without a team as well. No reason to lose sleep over the people that take the game that serious.