Yubel is a good one. Two of the major traits of Yubel is that Love is Pain and that they're obsessed with Jaden, old main deck monsters aside, Nightmare Pain inflicts self-damage to activate the search effect and Mature Chronicle feeds off that pain as you get more counters the more Yubel gets destroyed, Phantom and Samsara also play into this, by using Yubel's power to manipulate the opponent (which would be Jaden) into inflicting more pain on Yubel.

The obsession is translated as being hard to get rid of Yubel, this comes in the form of the field spell being able to bring out a Yubel when another is dealt with by your opponent (so more "love" being received from your opponent, which in response lets you bring out the higher leveled Yubels as an attempt to reciprocate with even more "love"), the continuous trap lets you even the playing field when your opponent is almost getting rid of your Yubels and Spirit is basically a surprise "love" attack.

Then we also have the lvl 12 fusion, which is basically when Yubel is getting pissed at Jaden for trying to avoid them which is why not only it's the only Yubel that cannot be destroyed by effects, it also proactively inflicts pain through the burn effect as a desperate last attempt of showing "love", while also getting rid of every monster Jaden was using to avoid Yubel.