[MORE INFO HERE IN THIS CONVENIENT BOX I FOUND]
On another site I'm on, there was a super hero contest where you draw yourself as an original super hero and here's mine? xD

Basically I draw the character's specific symbol into a notepad or really anything I can find (if someone takes my stuff I'd have to get creative) and bam character
extra notes about the power:
-It's easier to summon a character for longer depending on the trust level
-I can summon multiple characters at once, though it drains more MP and also depends on the trust level between me and the characters themselves
-I can write their symbol with anything on anything (as long as its visible), but I usually do it on my writing pad thing with pencil or pen or whatever
-Characters have all their canon powers and abilities, and I can only edit stuff like that, including any part of their design with their consent, when they're not being summoned.
-Characters are all in my head and are generally aware what's going on outside.
-I can talk to characters in my head, but can only physically interact by summoning them
-Yes all those stat meters do affect my performance which is why they're there and i also just noticed that xD
Also I have more characters than these 3 dudes (as you can tell from my new profile pic ;D), just they happen to be in a lot of the episodes so far xD