All fighters with a notable speed decrease in helplessness (besides the two already mentioned and Mewtwo):
/
,
/
,
,
(barely noticeable due to horrendous aerial endlag),
,
,
.
Most of them being moves that are potent OOS or mainly vertical recoveries, so the reduced air mobility is to increase risk.
Notably, Mewtwo's airspeed in helplessness is similar to that of Zelda and Palutena, who both also use warping up bs.
If by physical you mean items like Link's bombs sure, otherwise it's 100% transcendent. Dunno if it's better that way though...
Gee, why isn't Ryu known for being juggle fodder then? Because he has options to avoid attacks. And so does Mewtwo.
Rosa avoiding combos better is more due to her floatiness letting her bounce out (Mewtwo's fall speed is just average), which then gives her a chance to use her disjointed aerials to counter.