Dear Guru Maharaja, please accept my humble obeisances.
All glories to Srila Prabhupada!

Krsna is the Supreme Personality of Godhead, the source of all  other incarnations, and all material and spiritual worlds (basically everything).  The jivas are His parts and parcels and are eternally related to Him.
He is one but has many forms (Rama, Nrsimha, etc.). It is explained that Krsna has many forms because He reciprocates with different moods that devotees have with Him.

How the jiva becomes attracted to some form other then Krsna Svayam Bhagavan (If jiva originally comes directly from Him)?

Your servant Namacarya das

   ASA - Buck White/Tom Brown - One day in Vrndavana, actually the forest and village of Kama, Radharani declared that they were all going to play Rama-lila. She would be Sita and here older brother, Sudhama, would be Ravana and kidnap and hide her, and Krsna with all the Monkeys, gopas, would try to find her.

Well Sridhama did his job so well that Krsna and the cowherd boys couldn't find Radha for a long time and she said, "Oh, goodness! This is too long. Let's go find Krsna and play some other things", but Sridama twirled his theater mustache and said, "Haaa!  Haaa!  Haaa!  I am Ravana, King of Lanka, and I have kidnapped you for my pleasure. You will never see Rama again!".

Radha pleaded but Sridhama was very determined and so She was Kidnapped!

Well, we'll tell you later what happened,

but that is our understanding. All these other Lilas are so much fun. They fit into the Rasa dance, Vrndavan, in their own way. We want some chilis in the subji, but not predominant!

So, Krsna and Radha expand into other forms so They can go on playing these other pastimes forever, without stop.

O.K??