League of Legends XXV: Who is your Summoner, and what does he do?

[tyckspoon]

I think it's off-tank/tank, but I'm not sure...

Yup. You can also try going mage and pretend you're Gragas with the extremely long range of sapling tosses, but.. well, Gragas does that better- the saplings have much lower damage values and too long a cooldown. Mage only really uses 1 and a half of Maokai's skills (assuming you're using his ult as a nuke, basically.) His skillset works best as tank/initiator.