Hi, when I was summoning my first ones to try to level them I noticed the letters and the “-”, “+” signs changed. at first i thought this meant they had a type advantage but I was training at biteschools and the leters and signs kept changing so my question is what do these mean next to the first ones when summoned. also is lvl 99 the max lvl for first ones or is that just normal monsters. thanks for the info. 
Don’t think you can level them up but the “+” and the “-” are like school grades ie A+ os more likely to bet bonus actions than an A and so on. This is just wha t I think don’t know for sure
I think they just get more powerful, the higher rank you are
The more you summon them, the higher their grade. It has nothing to do with your own personal rank.
Lowest is F- , highest is S+. I don’t think this determines bonus actions, from my experience, the higher the grade the more powerful the first ones are.
I heard something like when u use a first one twice, they go up in rank…
I know for a fact that they can level up. If you check it in the in game pedia it will say lvl 0 but if you check it in a battle it shows its real level/stats, every time I use my first one they grow at least one level, I have my esapid to lvl 99 now, and its not rising anymore I belive this is the highest lvl first ones can become. more testing is needed :ph34r:
Also I can comfirm its not the grade when I look at its stats in a battle its rank was E (just found this part out :P ) however the letter next to its name when summoned was (D+) next time I used it the letter was (C-) and the time after that it was (C-) and the forth time it was © so I believe Crystal and Tajid are right on this part. I still dont know what these letters mean, however if I figure out something else I’ll be sure to let everyone know now back to goofing off uhh I mean research.
Been doing more research and screen shoted the stats every rank from (C-) to (S-) and no stat change. My guess is its a hidden feature or maybe once it gets to (S+) it resets and ups your grade by one, If I figure anything else out I’ll let everyone know.
its been (S+) for awhile and i cant find no changes at all. if anyone finds out what this means please post here but i think this thread is done for. thanks for the help figuring this stuff out until next time. :ph34r: peace out