"Bokeh" is a feature of the lens used and its adjustment, not of the camera directly.
Bokeh is generally improved by:
More rather than less aperture blades in a lens and
More rounded aperture blades
(eg Tamron 18-250 and Sonly SAL18250 are optically identical lenses (both made by Tamron) except Sony chose to round the aperture blades more to improve bokeh.)
Reduced depth of field is with resultant "blurred" background is generally a prerequisite to visible bokeh.
DOF decreases with
Special case - the mirror lens.
For a given focal length a mirror lens is low cost, compact and low weight. The disadvantages are fixed aperture, fixed focal length, and an "interesting" bokeh effect.
Mirror lenses are generally considered to have poor bokeh due to out of focus points forming "donut" shapes. This can be controlled but often not fully eliminated. Donut snobs hate them.
500mm mirror lens - donuts are visible but average viewer is unlikely to find them objectionable - a donut snob will hate this effect:
500mm mirror lens forming very bad donuts in background. You don't have to be a donut snob to see these, but the picture is probably still acceptable to many "ordinary people" :-)
Extremely low depth of field example:
Use of a reversed lens on the front of the main lens, to provide a "macro" closeup capability, will result in an extremely shallow depth of field causing the background to lose all features. Whether the resultant bokeh is pleasing in a given case is in the mind/eye/brain of the beholder.
Grass seed head using reversed lens macro. Sensor needs cleaning.