Let's look at the attribute panel first: Shunpei is a physical/blessing dual attribute output, and his basic attack power belongs to the T1 echelon among the same-positioned characters (about 5% higher than Joker of the same star rating), but his speed is medium to slow and requires the cooperation of his teammates. The core mechanisms are "Muppet War Cry" and "Great Sword Charge" - each layer of Muppet War Cry increases one's critical hit rate by 5%, with a maximum of 6 stacks. After the Great Sword is charged for 4 layers, the next skill will definitely hit a critical hit and add an extra damage of 150% multiplier. Simply put, this character is an explosive physical warrior who relies on critical hit rate and action frequency.
Suggestions for skill rotation: Use the first skill "Counterattack" to stack up the target first (the more times the target is attacked, the higher the damage, up to 4 stacks), and trigger the puppet battle cry at the same time. The second skill "Iron Arm Rush" is the charging core, consuming 30% of the current health, but it will directly stack 2 layers of Ragdoll War Cry and 1 layer of Great Sword Charge - note that this skill has a self-mutilation mechanism and needs to be paired with a nanny or a shield character. The multiplier of the ultimate move "Final Broken Sword" is as high as 620%. If released when the big sword is fully charged, the actual multiplier is equivalent to 620% + 150% = 770%. The single target burst is extremely strong, which is the ceiling of the current version of physical cards.
Teaming recommendation: It is recommended to pair up with teammates who attack frequently (such as auxiliary characters with "Pursuit" effects) to speed up the stacking of Muppet War Cry. For the survival position, the first choice is a character with continuous healing, such as "Sakura Futaba" (if you can draw it), or the SR "Iwai Munehisa" - his shield can offset the consumption of self-inflicted damage. In addition, Junpei's speed is low, so it is recommended to equip the "Hast Wind" set or bring speed-increasing assistance, such as the synergy skill of "Makoto Niijima".
Equipment selection: In terms of weapons, the specialized weapon "Shatter and Destruction" is the best. Its secondary attribute provides a 12% critical hit rate. The special effect is to stack an extra layer of charge after releasing the ultimate move. If you don't have a special weapon, it's good to use "Rage Sword" (available in 3-star stores) as a transition, which can increase critical damage by 15%. Holy Relic (Revelation) recommends the "Rampage" 4-piece set: when the health value is lower than 50%, the critical hit rate is increased by 25%, and it is perfectly triggered with the self-mutilation mechanism. For main terms, choose attack power, critical hit damage, and critical hit rate; for subterms, prioritize critical hit rate > attack percentage > speed.
Recommendation for resource investment: you can unlock core skills (Talent 3) by reaching level 70. There is no need to rush to level 80 - because the attack power increase from level 80 to level 90 is only about 3%, the price/performance ratio is not as good as brushing revelation. The order of skill upgrading is: ultimate skill > second skill > first skill, as long as the passive skill points are maxed out.
Final reminder: This character performs very well in difficult dungeons (such as tower levels), but his daily clearing efficiency is average because the foreplay is a bit long. If you are a player who pursues extreme damage, it is worth taking; if you just want to hang up comfortably, you can consider skipping it. The data is here, weigh it yourself.
P.S. If you have actual measured data, please share it in the comment area. My test server has been open for 3 days, with a sample size of 100 skill cycles, and the error is controlled within ±2%.