Hello everyone and welcome to my 271st analysis, this time featuring Ursus.
Overview: Ursus has good Base Strength and access to Pierce, which allows him to deal with Taunt monsters and Mirror effects. He can also give himself damage boosts that draw attention to him. Hardened at Rank 1 also allows him to dodge some debuffs. Unfortunately, that's where all the positives end because Ursus has a mediocre moveset, bad Base Speed and a weird trait evolution that doesn't offer much. Still, he's usable.

Rank 0: Freeze Immunity: Decent.
Rank 1: Freeze Immunity + Hardened: Better.
Rank 3: Freeze Immunity + Hardened + SC: Protect Trait: This is quite pointless because his trait doesn't offer much already.

-Ice Claws
-Cruor Slash
-Pierce Crystal
-Greedy Ursus/Angry Ursus
Runes: 2 Strength 1 Speed/3 Strength
Mutant Rune options: Strength&Life, Speed&Life
Relics: Swords and Traps

Build Explanation:
Ice Claws is a Pierce move with 60 Base Power that also applies Bleeding to all enemies. This allows Ursus to hit the attackers in a Taunt-Dodge Area core and even apply Bleeding to them to soften up their attacks while extending damage, but the Pierce is removed atfer the attack. Cruor Slash is useful to halt buffing attempts and it's the second most powerful attack Ursus has. It can be used after Ice Claws to hit enemies that are behind defensive effects. Pierce Crystal is an AOE with Pierce that gets removed afterwards, but the main use for this is the debuff cleaning before the damage gets dealt. This can also remove Nanovirus or Positive Effects Block to successfully get the Pierce from this move. Lastly, Greedy Ursus is mostly the choice against non-Anticipation monsters, since the damage boost is instant. Following this up with either of your single target attacks can kill a non-tank enemy, making it especially good with your Pierce attacks. Angry Ursus is a safer choice that makes Ursus a biggger threat, giving him Double Damage, Precision and most importantly, Evasion to make sure he doesn't lower his guard as he sets up.
2 Strength 1 Speed with Life Mutations is a standard on attackers, but 3 Strength can allow Greedy Ursus to kill an enemy with a higher chance of success using Ice Claws or Cruor Slash - this especially matters in higher ranks where Life scales higher than Strength, making it harder to one shot.

Teammate Options: For Teammate options, check out this article.

Countering Ursus: Warmaster Thalassa can remove his SC, then disable his trait, then Freeze Ursus with a chain of extra turn attacks. For more Counter options, check out this article.