Hi,

1/ You can check option for change the font for body text via Customize > General Options > Font for Body Text.

Also, you can change the size for body text via Customize > General Options > Custom Size Of Fonts in Posts (Numeric value only, unit is pixel)

To change the color for your pharagraph inside article, please add more this code to Customize > Custom CSS:

\
.post-entry { color: #444444;  }

Change 444444 to any color code you want.

2/ Unfortunately, as I knew, no any wordpress theme on the themeforest has this feature.

Best Regards,

PenciDesign