Funny how many assumes that 'fun' equals solo ability. :P
Anyway bard has always been the most fun for me, i've never twinked anything. Bards has access to a wider selection of gear than other classes and can mostly use both caster and melee exclusive equipment. They don't need any kind of weapon but can benefit from most of them. The songs covers almost all kinds of spells and don't require any reagents, bards also gets many skills like sneak, forage and tracking.
They excel in groups and are good at soloing once you get comfortable qith twisting songs. Personally i find swarm kiting boring as hell so i stick with the groups or fear/charm kite when soloing.
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