Ball is a blue ball with a slightly deformed circle as a body, and has a circular gradient making their color lighter near the upper right of their body. They are also armless. In the episode, Ball is recommended by englishcreamcakes, and is the same as the Ball recommended in a previous episode, but is smiling.
Diamond is a recommended character who was recommended by kiki3510. His/Her first appearance was in Reveal Novum along with some other recommended characters. He/She is a classic cloudy blue diamond, often seen in cartoons and such.
Elimination Contestants is a character recommended by bobbo44445 in Reveal Novum. It is composed of the bodies of BFDI contestants, as well as a frown face in the middle.
Flamed Stove is a recommended character from episode 18. They were recommended by coolmatt1019. They are a stove with one burner producing blue fire. Strangely, they are producing fire without anything to turn on the burner.
Laddy is a recommended character in Reveal Novum. It was recommended by lickilicky64. It is a white ladder. It was seen carrying Scissors, then flung him/her up the sky when Tennis Ball hits Laddy as a part of the chain reaction leading to Leafy's successful over the cliff.
The Yellow Tomato is the "cake" given to the winner against the 30 recommended characters that got the votes to join Battle for Dream Island in the Cake at Stake for Reveal Novum which-so happens to be David. It exploded on David's face when the Announcer threw it at him. It was recommended by epiczano.
One of Ruby's sisters is named Diamond, however she doesn't look like this Diamond and has limbs.
Apparently, no one likes Yellow Tomato as they showed disgust to it.
However, Fanny says "I want that Yellow Tomato, I really do.", indicating she likes it.