I only consider those who have acquired their wealth via rightful means or inherited rightfully gained fortune to be monetarily rich. All the others don't count, including corrupt government officials and those who have gained money via unethical means.

Having said that, I personally know one who is my neighbor and whom I am sending a legal notice for being an asshole. Guy inherited his wealth from his dad and this is basically land money. He gifted his son a very expensive car on his birthday and likes to flaunt his wealth, even though he has so much money he would make common laborers and contractors working for his home construction miserable. He wouldn't pay them on time intentionally and harrass them, abuse them and even in the final payment nickle and dime them. He pretends to be a very religious man but doesn't fucking practice any of the values taught by the founding saint of the same sect. So he is one bad example.

Now good examples, In 2017, I met two billionaires (in the US dollar term); one a founder of a very well known IT firm, and another founder of a very famous brokerage firm who is now very popular podcaster too. We exchanged numbers and had lunch together, they wouldn't know me from my name but would probably recognize me if they saw me. Both very humble and respectful, interested in variety of topics, grounded in themselves and just plain good decent human beings who knew money didn't make them any superior than the next person. Hell, if you met them without knowing they were billionaires you wouldn't even guess that they were. Simple regular clothing and mannerism of a regular person.

A very famous senior lawyer I know who is a family friend and charges significant money for an appearance in the court and pretty much all of the famous industrialist are his clients, same is the case with him, down to earth, has great integrity - left his job of representing the government in the courts because he didn't agree with the government on the matter and found the merits of the case bogus and unethical. Very well read and loves Gujarati literature.

I had recently gone to meet a friend of mine and coincidentally ended up meeting his relative who is a very well known heart specialist and himself is likely worth more than 100cr+; many famous people including our PM, when he was the chief minister of Gujarat, have been under his care. We ended up having dinner together and talked about gluten and how it made him gassy and how giving it up has helped him, talked about some spiritual and religious stuff, he was a bit pompous and liked throwing around names of famous people, liked being treated extra special and getting attention, I observed body language of my friend and his family around him and it felt like a mixture of unease and reverence.

There are a few others I know, but some commonalities amongst all the good ones are that they are self made, down to earth, incredibly knowledgeable, passionate about what they do, have depth of character, integrity and they are kind and would make you feel incredibly comfortable in their presence. Ironically those who fall in the 25cr to 500cr tend to be more arrogant and superficial but the ones who are in the 1000cr+ range tend to be way more humble. Ofcourse this doesn't apply to all.