Admittedly he DID sport an old timey “Strong Man Moustache” and a similar jovial personality, but that was more to make him a more approachable businessman as opposed to the stoic muscle glacier.
The most fun part was the homebrewed flavor/cost changes to his spells, as both me and the DM of the Moby Dick arc are former EVE online players, we had a kind of side economic game between the two of us where we more or less mulled over the concequences of the party’s trade and influence on the seas.
Basically, his magic was fueled by currency, and the little splash I took of warlock involved deaths of Foes caused by fitz granting a kind of “soul money” to be used as part of the great currency conspiracy. Mostly very little direct game impact, but more impactful on the greater political board so to speak.
Part of his aims to bring down the legacy of Xanathar include turning himself into a quasi lich-golem made out of literal money. Which is also funny considering any wizard I play has about a 50/50 shot of becoming a sentient object or some similar thing by the end of things. Or dead. Almost never a happy ending for my spell-worms.
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The pessimist in me says to plant some grapes, but here is hoping!