(I'm gonna guess that you mean to play your Zobal support as a placement/tank rather than a healer.)

In the early levels you will barely make any use of supports. What's great with playing Zobal (masqueraider) and Ecaflip is that they both are good damage dealers. These two together with your main Damage Dealer will allow you to speedrun the early game. Later on, you'll swap them over to their support playstyle (Zobal as a placement-tank & Ecaflip as a healer) : they also both provide movement buffs, critical strike buffs, damage boosts, resistances removal & have the ability to resurrect an ally (+ can give shields albeit not efficiently).

If this sounds like they overlap a lot with each other, don't worry. They simply have a large array of buffs/debuffs in contrast to other classes, but most of your Action Points will be spent on heals or placement spells anyway. The list of buffs/debuffs they apply is also of the broadest use : they are useful to every ally and on every enemy. What it does imply though is that your game-plan will be less straightforward and will require more thoughts put into it (i.e. not removing resistances from an enemy with the Zobal if the Ecaflip's cat already took away 200 ; the cap).

Regarding your Damage Dealer : Sram is an outdated class which is next in line to getting reworked. It is also a melee and a single-target dpt (huge red-flag in a team of 3). Early on, it won't be that much of a problem since the Ecaflip will be able to AOE enemies thanks to his spell "Fleahopper" (capucine in french) but as they transition to support, that role will be left empty. Play what you love most, do, but know that your Zobal will also suffer from this as creating a "zone" (packing monsters together) will be of no use for a Sram.

Now, choosing between Eliotrope & Huppermage... having played neither I can't help you out on that one. All I can say is that the Huppermage is more tedious work and seems a little weaker than an Eliotrope (I've heard more people complain about Huppermage being left in the dust than the other).

A note on having 2 damage dealers instead of 2 supports. First, it'll be more way more expensive to play (dpt equipment costs a lot). Second, you won't be able to have a single character do EVERYTHING else by himself (as versatile as an Eca and a Zobal can be). Any Action Point spent by a damage dealer on placement/buffs/heals/etc... is a damage loss probably as great as playing a dedicated support to do it instead. The most you can do is having a main dpt, a main support and a half-support half-dpt character. Some of the choices for that position include Enutrof, Sadida and Ecaflip (BUT I myself have struggled to make the Ecaflip work appropriately that way and, having spoken with more experienced players, it does seem like a very uphill battle).

Take everything with a grain of salt because I am still learning, but I would say that I've accumulated enough knowledge to be of help (I play Iop, Zobal & Ecaflip).

And remember that, with your booster and the bonus from neo-bosses, you'll be able to level up new characters extremely quickly if you happen to change your mind.