UJM's are a bit better than cruisers for tall guys.
The 1983 VT500C I own now is moderate at best for a 6'3 gorilla...
its a lot more like a UJM than a Cruiser, and that helps a bit,
which is also why there's a highway bar on it for leg relaxation
Some good starter bikes for tall guys are the Yamaha XS400 or XS650,
and pretty much any CB400, 500, 550, 650, etc...
The best starter bikes for tall guys are probably Dual-sports...because they sit tall as heck, which is GREAT for us tall guys...downside is they suck on the highway. So if you are city/dirt, they're perfect...but you quickly notice they'll beat you to death in multiple ways on the highways. Which is why I go right back to UJM's...they do it ALL....City, Highway, Dirt, doesn't matter, they handle everything.
And with that if you stay under 750cc's, you don't have to handle a lot of weight, so that keeps everything Nimble, even if you throw on a set of hardside saddlebags.
End being, a tall skinny guy on a 500-750cc 80's-style Shadow is gonna be one happy camper.
The VT500C with 54HP is more than enough power for him and a gal on the back...it's actually more HP than my old Yamaha Virago 750 had...in fact, more than the current VT750DC @ 45HP...things to consider seriously
The VT750 had 63HP...nice little rocket, that!!
If he's looking NEW, and comfy for a tall guy...the Honda CTX700N may be just the thing.
It also comes either 6-speed, or the Automatic Transmission...solves the whole Shifting Equation that a lot of kids today can't seem to figure out...and OMG, get the ABS...it's worth it!!