Can Buu absorb Broly?
He was made when Buu absorbed Broly. He also has two forms: base form and legendary form. Bruuly’s base form can easily surpass a Super Saiyan 5. Bruuly’s legendary form can defeat any Super Saiyan below Super Saiyan 11.
What happens if Kid Buu absorbed Broly?
If the movie turns out in an expected way, thats all that would happen. If you mean Dragon Ball Z Broly then nothing would happen. Broly from then is so much weaker then Buu that Buu’s power would barely increase and you wouldn’t be able to see any real difference. We couldn’t, we wouldn’t, and we would all die.

What happens if Majin Buu absorbs Zeno?
Zeno is omnipotent. Buu would absorb him, changing forms to more resemble Zeno. Then Zeno’s consciousness would eventually take over Buu’s body.
What happens if Majin Buu absorbs Beerus?
Super Buu absorbing Whis would be impossible due to Ultra Instinct. If he absorbed Beerus, Whis would either use his power to get Beerus out or reverse time and warn Beerus what’s about to happen. Either way, Super Buu gets the Zamasu treatment after it’s all said and done.
Who is stronger Broly or Buu?

Kid Buu is far superior than Broly in every aspect. Broly is somewhat weaker than an an ascended super saiyan(in this case goku) or about as powerfull as Vegeta when he fought perfect Cell for the first time. It took merely a SSJ with borrowed power to kill LSSJ Brolly.
Can Buu absorb Jiren?
Buu’s absorption and candy beam isn’t absolute. It’s not an ability that works on anyone unconditionally. Against majority of ToP fighters sure, but against Jiren, no way.
Can Buu absorb Moro?
So, no, Buu cannot absorb someone as strong. Moro would get absorbed because Buu would have the full God ki at his disposal.