I played a PS3 once, but other than that, only one I've played/owned is a PS2.

Dom from Gears of War was pretty sweet. Also the Cole Train. And Baird. Gosh, those guys are all cool.

The Arbiter from Halo, though I'm not really sure if he'd be a sidekick. Varric from Dragon Age is cool too.

Hm... I can't think of many games I've played that had memorable characters I'd consider sidekicks.

Assassin's Creed II was my favorite for campaign. Ezio really made Assassin's Creed really enjoyable.

Favorite for multiplayer was Assassin's Creed III. Sadly, all the best techniques I discovered (well, learned from my betters) in 3's multiplayer were deemed as glitches, and thus not in 4's multiplayer.

I've wanted to make video games since 2008; since I was 11. Though, since 2007, I've been playing a user-generated gaming platform known as ROBLOX, which lets you build maps part by part (like LEGO, but more complex), and then use LUA to script functions, basically making whatever you want. Over the years though I've never gotten myself to start making games on it. It's so much easier to just play the game. It's like my most difficult challenge: to use the thing that's sitting in front of me, free to use. Heh.