What is Tusk role?

Hello.

I've found that most people go mid with Tusk, but I think his kit is very supportive. Can anyone point me, what's his role?

Hi.

I am not that sure if his kit is very supportive. Let's think what Tusk has:

Ice Shards is a minor nuke with a some kind of trap/invulnerable, untargettable ground unit.

Snowball is an invulnerable unit that is able to transport Tusk himself and his allies towards the target.

Frozen Sigil is a semi-spammable movement and attack speed slow as a flying unit.

Walrus Punch is a critical damage attack with 1 second disable and slow (2/3/4 seconds).

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His skills screams one thing: LET'S GANK!.
He is a midgame semi-carry with huge utility and snowballing (ha!) potential. OF course he can be a support, but he won't be that effective (Second In-House game have proven that :D). His skills goes very nicely with each other and he is probably something like Nyx Assassin - You use a full combo on 1 person and you have almost nothing else to offer. You wait for cooldowns and repeat again. Ice Shards on a hero, Snowball to get closer, Walrus Punch an enemy hero in the air and then Frozen Sigil to slow him down and finish him off (if he won't die straight away). If you will fail to kill someone that way, you just go back to regenerate and try again. There is not that much you can do beside that.
Tusk requires experience more than gold, so that's why he is a midlaner or an offlaner.

I'm far from an expert, but I played 7 Tusk games trying to get a win with him in the all hero challenge. Also a few games before that.

I agree, he works best as an offlane roaming ganker. You're not gonna solo kill most heroes, even with the full combo, but teaming up with an ally will surely get you kills.

I like to vary the combo sometimes. The standard is Ice Shards to Snowball to Walrus Punch. But sometimes I save the Ice Shards to finish off a retreating enemy if Walrus Punch didn't finish him.

He's a lot of fun to play, though. One of my favorites.

Nothing that Xyrus touches is actually effective. (except math)