One thing you can do to try and improve on this style is instead of outline in black, select a darker shade of the colour you're outlining.

Whilst the sword on the right has clearly defined borders, it appears flatter and more persistent than the sword on the left where the use of coloured outlines helps demonstrate the shape of the object better without being so distracting.
There are times where you might want the effect provided by the first style but I'd argue against using it for characters and saving it for objects that need to be clearly visible against a noisier background.