Seeing if I can take care of the basic MM ones first.
The Bulette is truly an iconic D&D monster, having originated in the franchise and remained along for all editions. As the legend goes, Gary Gygax himself liked to buy cheap toys to use as miniatures back when he DMd games, and the Bulette originated from a supposed plastic dinosaur. Nowadays Wotc wants you to buy their expensive miniatures, but that's another story.
Besides looking awesome, the Bulette's tactics are pretty simple: burrow, emerge, bite/claw until stuff drops dead. Surprisingly it doesn't have improved grapple with its bite, I guess it must like to chew properly before swallowing.
Anyway I went along the whole "burrowing predator" that suddenly jumps out of the ground and starts tearing stuff up. Some tricks only work under the earth, and others that only work while outside of it. The Bulette doesn't have much in the ways of ranged attacks, but it can make people trip at distance to slow them down so it can start chewing on them, and the ultimate is basically returning to its "primeval" instincts (because basic bulettes just have int 2, thus the awakened tag) and just start chewing on those delicious halflings that tought that being small would make them harder to nom. Also increased the burrow speed because the 3.5 version having just 10 feet just doesn't allow for very good ambushes.
So if you want to play a Land Shark, the bulette's for you!
Gonna stick a link to a webcomic that caught my interest here because I have no place to write it down, wonder if anybody will notice
http://faroutthere.smackjeeves.com/comics/1027691/page-44-whatever-happened-to-whats-his-name/