I realized I could play a young man who summons a giant robot. All the thing needed was enlarge person and mage armor and later evolutions to boost armor and size. Buster Machine Number 15 could have fists that shoot out by using the reach evolution + slam and improved natural weapon. In order to buff him the young man could do tokusatsu style somatic gestures and speeches about friendship and justice.
Also, if Buster Machine Number 15 ever fell in battle, the young man could call him back to the fight even stronger with a short speech about friendship and force of will, using summon eidolon and augment summoning. I've been waiting for an appropriate game to play that character in.
The other character is an elderly gnome paladin to desna who bonded with an outsider to keep helping those in need by borrowing its strength. He has a few levels in paladin and the rest are in synthesist. His summoning ritual is an oath he swears to defend justice as well as the rights and freedom of all sentient beings. I wrote it out in 10 6 second stanzas somewhere, one for each round in the minute long summoning time. In his transformed form he focuses on armor and multiple enhanced claws. He looks, acts and sounds a lot like a certain autobot transformer, sans the morphing into a truck, and with the addition of limbs that bisect in combat for additional attacks.