This is my attempt on after season 3 from Transformers Animated lets hope I do some justice on my end where I do my take

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After the Autobots come back to Cybertron from battling Animated Megatron and his cons and bringing them as prisoners, Sari who wanted to know more about her heritage decided to go to Iacon and see if there were any records that may have been on her  or any protoforms that were sent away or that may have been on the Nemises.

After looking for 35 minutes she came across a record of two Cybertronians named Kireina and Footage {HuntressNuva oc} who were on different factions being Kireina on the Autobots while Footage being a Decepticons. The Records were showed that the two had a secret relationship and than had a sparkling named Skysiren resulting the sparkling as an Autocon, The relationship was soon later found out by the council and order an arrest for Footage for treason and experiments. Before the arrest could happened Footage took the sparkling and put it in the stasis pod and sent it off world and was soon arrested after that.

{Huntress my apologies for if I got it wrong on Footage backstory ^.^'}

As Sari continued to read she keeps thinking that she is Skysiren but dismiss knowing its not her and continues to look for a little bit before leaving the hall to join up with her friends to do a memorial services for Prowl.

Sari than continues to learn about her Cybertronian heritage but is continued to wonder who was Skysiren is.

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Okay its a start I'm trying my best here of doing my version of what happened after Transformers Animated season 3 and what season 4 would be if it ever aired. Its a start. Hopefully I'll get more ideas for this and I really like this its good. Yes Kireina is my oc while Footage is HuntressNuva's oc we've been creating Sari's origins since someone has the tendencies not to explain stuff to us *glares at Hasbro* but fanfics writers are what best sometimes. So expect a lot of Animated from me