This is a current opinion the JP tier list. There is always room for debate but the site has a good layout and it is pretty accurate for most of it.
https://setsupad.wordpress.com/category/puzzle-dragons/reviews/jp-tier-list/
There are some cards you should focus on as leaders and others as subs, he breaks down both.
It's hard to get a feel for your box without the color breakdown but you have some nice leads mixed in there. Seems like a combo team is your best bet over mono.
pretty much agreed with the list. but note that SOME of the leaders REQUIRE very specific subs to create a strong team, or they're very fragile/unstable
I have all of the leads and subs listed there, with an exception of the dark version of light Kali and will get Yomi Dragon in the next round. Pls allow me to leave some comments here.
Tome-Creating White Phantom Demon #1951 - requires multiple of himself as sub and filled with Awoken Leilan #2073 and Shining Wing Kiriko Another #1973. Awoken Ra #2012 if fixed dmg is needed or Dancing Flame, Amaterase Ohkami #1557 for clearing binds. Perfect team for short dungeons, subs can provide enough light and red orbs to activate LS. White Phantom provides enough SB so all skills are ready in R1 or R2 after Leilan skill in R1.
Ra Dragon #2259 - requires at least 1 Dark Kali #2078 to assure 6 colors orbs for x64 powerful LS attack. Fat Chocobo has similar skill but much lower spec so strongly not recommend. In other words, only get this char from mp store if you already have Dark Kali.
Awoken Ra #2012 - much simpler setup, can put 2 of either Light or Dark Kali, Awoken Isis for short cd to activate LS/clearing binds/fulfill 2 out of 5 colors or Sun Quan #1741 if need to delay enemies, can be binded though. Last spot is good for dmg control such as Thief #1902 or Indra #657, or another Kali.
Orange Dragonbound #2441 and Blue Dragonbound #2443: requires Awoken Thor and Awoken I&I as friends' leader respectively to create high hp/atk/rcv team. note that not many players will invest in Thor/I&I so maybe good idea for Best Friend if you plan to main these 2 powerful leaders. They can be good subs though with very high spec in general.
Just some personal comments, but I recommend to have an ideal about the well formed team before investing into any specific character. Say #1901 is strong but pretty useless without multiple of Pandora as sub. There are many more versatile characters worth investing