Ichigo can turn into UR if we upgrade spirit relic. To upgrade spirit relics, we need spirit sources that we can get from story quest, extream challenge, arena etc. bleach Eternal Soul code
Power competititon. In this event we can get UR Shard if we get good rank. Ranks are based on power.
we can get the UR character shard(zangetsu, urahara) from soul jade summon. Chance of getting a UR shard from summoning is around 10.2%.
collect 150 shards and combine them into a UR hero.
Squad rewards. if you have joined a team, you have the chance to get UR shard aizen by following the features in the squad.
Kenpachi contest. in this arena you have to fight other players to get points which you can exchange for kenpachi shards.
Take part in an event with a UR character prize.