none of them
never
The cast of Dinosaur King - 2007 includes: Sebastian Arcelus as Rex Owen Madeleine Blaustein as Helga Kether Donohue as Zoe Drake Darren Dunstan as Zander Zoe Martin as Rod Sean Schemmel as Dr. Owen Marc Thompson as Seth Laurent Vernin as Zander
No, she does not. She does not kiss anyone romantically, although she kisses both Jimmy and Max on the cheek.
Maybe because when Zander said that he thought Rex liked Zoe, Zoe blushed. But however, she and Rex don't have as much as a relation as Zoe and Max. Zoe and max have much more romantic moments.
Your question was not very clear. But if you mean was there romance between Rex and Zoe on dinosaur king the answer is no. But on the second series Zoe is shown to have feelings for Max. She tried to kiss him at one point, got jealous when Max had a crush on a Persian princess, cried when he sank in quicksand and clung to him like a limpet when Spectre was yelling at everyone through the intercom. So yeah, Max and Zoe all the way!!!
Drake
In fanfiction they kiss alot!
Perhaps. However, in Japanese culture there is a strong sense of 'nakama', which is on the line of 'Best Friends Till Death Do Us Part', so it is possible that she cares for Rex since they were children, inferring that she has known the two since she was more or less born.
no
He does not kiss anyone, but Zara does kiss him at the end of the Arabia Arc. He and Jim accidentaly kiss in X-Treme Map quest while attempting to kiss Zoe (Zoe just ducks).
Unfortunately no. But Zoe TRIED to kiss him in the episode 'Amazing Treasure Race.' The actual clip can be watched on YouTube.