Kirikki

https://www.dndbeyond.com/characters/86202960

Kirikki-Tokk was a smuggler in wildspace who ran into an emissary of the One Who Dwells beyond. Compelled by his message, Kirikki made a bargain for a fragment of dark power. Now in combat they are a whirling terror, swinging a flail, lighting enemies alight with green flame, and loosing crossbow bolts all around. Now traveling with the emissary to the Rock of Bral, what awaits there remains to be seen.

I thought that the idea of a chittering bug caster would be fun, and the secondary arms reminded me of General Grievous. The ability to pop off hand crossbow shots while fighting in melee seemed to add an extra dimension to the fighter and might allow even more crowd control than the eldritch knight provides out of the box.