Okay so Elf, I mentioned the possible applications of Transformations and what implications (Ramp-Cannon Alanis) to be wary of, right? Well, here's an implication to be wary of for Summoning: Tank-Cannon Alanis. Now, while this is weaker overall, the issue is, it's far more versatile. It works perfectly well for other characters, and can be re-purposed for Tank-Debuffers, Tank-Buffers, Tank-Healers, etc. Furthermore it does not even use ramp-up, so even with a Signature system, it is still permissible.
The idea is to turn Alanis into a Tank character, so dedicated to her role that she has no offensive options at all. The emphasis here is on protecting another character, rather than drawing aggro or taking hits for everyone. The actual Cannon half of the build is formed by a specialized Glass Cannon geared for overwhelming offense at the expense of all else. Now the main reason behind this build being so powerful is that both halves are highly specialized and have their Actions geared towards a single purpose. They naturally synergize with each other quite well, one trading firepower for all else, the other a dedicated shield for a weaker character. It'd be fine if the Glass Cannon was another PC, plenty of shipping opportunities and RP after all.
Issue is, the Glass Cannon in this build is not a PC. It is Arcane Phantasm, a physical manifestation of her magical power, a PC-Grade Summon. Something like Mint Gale, Gozer and Lynch. It is summoned immediately on Turn 1, and if it's still standing by Turn 2, good luck getting rid of it, because Alanis will be shielding it from that point onwards. With a dedicated Tank supporting it, it's free to just unload Kinetic Slam after Kinetic Slam into foes without having to worry too much about reprisals. Well, short of a Desummoning Field, but if it was say reflavored into something nonmagical, then not even that will work. Sure you could bring an Action like that but without such restrictions into the fray, but it'd also wreck every other summon, not to mention that Alanis would still be perfectly capable of pulling Tank duty for everyone else.
The issue with this kind of build you see, is that it's easy and the person using it has full control over both halves. No need to find a Tank. If a character needs a Tank to hide behind, give it to them as a Summon. Or turn them into the Tank and make them something that fills out their role on their behalf.
Ramp-Cannon Alanis, please welcome your new roommate. May the two of you start a nice little sitcom set beneath Sanure's bed.