My favorite player to root for is Eric Kratz. He's not a guy having a big impact, he's the guy I'd like to see have a big impact. I even considered changing my avatar to KingKratz but decided that I should honour the memory of my deceased cat rather than erase it so that's not happening.
As far as players who are having an impact, I love to see Hutch having success. I called him the best pitching prospect in the system a few years back, ahead of the big 3, so in a selfish way I'm simply glad to be vindicated but far more importantly, I'm glad he's come back so well from his injury (something I had huge doubts about) and I think his success is a huge, possibly season saving, break for the Jays.
I also want to give out some huge props to Steve Tolleson who has given this team a huge lift. This team is like a whole new team now that they've found a way to deal with the 2B situation and the unspectacularly competent Tolleson has turned out to be a great under the radar pick up for the Jays. Even if Juan Francisco dissapears, the Jays at least have someone who could be part of a solid 2B platoon with say Kawasaki. That's a whole lot better than watching Ryan Goins every day (I genuinely feel bad for Goins for being so miscast, it's not his fault that the team was asking way too much of him).
And finally, who cannot enjoy Bautista answering the haters. It's easy to forget the extent to which the fan base was starting to turn on him. Even the usually innofensive Jerry Howarth was on his case. Bautista silencing his critics just feels very righteous.