COMBATANT
While your primary focus is to use the Kantus as a utility piece, he's actually not that bad of a tertiary attacker.

His Special Power gives him Perplex (and Support) for 4 clicks, and he has a very nice attack value of [9] or [10] for most of the dial, so he can easily pick off other support figures or even thouse with just Toughness. Perplex his damage up to 3 and he can even deal some damage to targets with Invulnerability.

In Golden Age games, Armor Piercing is a great option, and so is the once abused Nanobots. I'd even carry the super cheap Frog Legs if you happen to run into a water based map! Personally, I think Pounce is an excellent option too.

GRENADES
The Kantus is equipped with one very powerful Ink Grenade. Not only does it deal 1 Penetrating Damage, but it has a chance to deal an additional point of Penetrating damage the following turn!

GRENADE POOL/GRENADE TYPE(S): +1/Ink (1 penetrating damage): Place a hindering terrain marker in the target square. At the beginning of your next turn, deal 1 additional penetrating to each character occupying the target or adjacent squares, then remove the marker.

If you're playing with other Locust Horde figures (or even COG Gears), then you get even more grenades to play with! That being said, I'd advise against playing an all Gears of War team just to get more grenades, espcially since the Kantus has the very useful Rewards of the Faithful trait.

CONCLUSION
You may be very hesitant to throw a 70 point healer on your team, but you shouldn't. His full mobility gives him the ability to go anywhere he wants and his high attack values with a full dial of Support is simply a gold mine! The 4 clicks of Perplex and the Ink-Grenade helps keep the Kantus just dangerous enough to be a threat, but the late three clicks of Super Senses will help with that.

The Kantus' primary use should be as a mobile doctor, so always keep that in mind when playing him. For 70 points, he's is 100% worth it!