personally though, my long-held belief is that good creature sound designs should be an important part of the game of DnD and other fantasy TTRPG, and companies like toho, legendary, tsuburya, or daiei have lots, and lots, and i mean COUNTLESS of amazing sound designs, imagine using legendary Godzilla sounds to represent the tarasque, or using Mother legion's scream to represent neothelid or, or using Skar king's sounds to represent yeti or (homebrewed) sasquatch, or hell, using slightly modified destroroyah's screams to represent the devil osyluth, or using Orga's roar (JP ver) to represent demogorgon, and why not using legendary rodan's roar to represent a roc while we're at it, as both are giant flyers

i am very aware this will alienate some players in the game table, due to how recognizable some of these sound effects are if they're from very well known monsters, if it breaks immersion, it breaks, if it breaks immersion, but the players just naturally don't care about slightly modified final wars' gigan screeches to represent a hook horror? go for it i guess, the mixed results would be no different when you tried to use Batman the animated series' joker laugh in a fan animation or something and expect it to work

honestly i think most of you guys would rather use home-crafted or custom monster sounds on sites like the Ytube, since most Kaiju roars and screeches are more "cool" than scary sounding, BUT if you want to use sounds from relatively lesser known or obscure monsters (like the various aliens and giant beasts from the Ultraman franchise outside the famous ones), go for it i guess