Titan scores drive my selection. After some wondering, I arrived at the opinion that the most gain of use with limit breaking a hero is (1) for titans, primarily because of increasing tile damage and secondarily, because of increasing survivability for the def-downers; (2) my staple defence heroes, (3) my staple healers, (4) the most important attackers, in this order. Titans first, I must get better at titans than @Muchacho .
Also, since most of my defence team is 5*, I cannot yet LB them. That said, when the green aethers come, Brynhild will get a set without hesitation. She already makes my BK nearly unkillable in my defence team, so she merits it largely…
So, as I wrote a bit earlier, my choice was Jott for titans and Sonya for all-round usefulness in blue (this is a bit out of my scheme, but if I am not entitled to be a bit whimsical as emperor of my empire, then it is not worth to be an emperor), and Scarlett and G. Falcon in red. There again, I hesitated a bit for Colen, simply again because I use him almost everywhere. But I don’t have his costume, whereas I do have that of Scarlett, and he does not come for titans.
After LBing two 4*, you still have some aethers left, enough for a 3* and a 4* costume, so I LBed the costume of Scarlett, and am hesitating between Hawkmoon, Sudri and Bauchan.
For red 5*, it will be a hard decision for me. BK for defence? Or Gefjon for titans? Or who knows, by the time I will have Baldur tried, fallen in love with, maybe him? I will see. Maybe Gefjon, as she too comes with me very often, for titans too. BK is strong as he is. I hope after LBing Brynhild for my defence, which will happen asap, Bryn will be even more solid and surviving longer to keep BK alive even longer. So maybe Gef, and then BK second.
With these reds, I am really too lucky… not a typical FTP consideration, whether to limit break Gefjon or BK…