The preview does not explain the gain
Cancel the merge and record the current fighter, variant, level, damage, and cooldown before trying again.
Review duplicates, protect mutations, and compare visible before-and-after fighter stats without inventing a merge XP curve or maximum level.
Quick answer
Merge only after you identify the exact fighter and variant, protect anything rare or mutated, record visible stats, and decide which team job the level investment is meant to improve. The site cannot predict a post-merge level because the XP curve and cap are not verified.
The official Roblox description says duplicate anime fighters can be merged to level them. Official promotional media also shows a Level 1 versus Level 67 comparison. That proves the merge-and-level loop exists, but it does not publish how much XP one duplicate gives, whether all variants merge the same way, or what the final level cap is.
A merge is easier to judge when it solves a named team problem. Invest toward boss pressure when high-HP targets stall the run, toward wave coverage when groups leak, or toward steady cleanup when enemies survive between larger attacks. Do not call a fighter optimal simply because its level is higher.
The steps stay useful without pretending unknown rates, rewards, or formulas are facts.
Read the fighter label, rarity or variant, level, and any visible mutation before selecting duplicates. Similar-looking fighters can have different long-term value. If a name or variant is unclear, stop and confirm it in the roster rather than relying on a community nickname.
Turn on the protected-variant reminder for every unusual copy in Team Lab. The official game description confirms rare mutations, but their merge behavior is not documented in the selected evidence. Treat the warning as a pause, not proof that merging is forbidden.
Enter the damage and cooldown you can see before merging. If the game previews an after state, compare it as a separate scenario or write it down. Team Lab calculates display-only damage divided by cooldown and never applies a hidden mutation, trait, critical, or enemy-defense multiplier.
Complete the merge when the copy is expendable and the level investment supports a job your team needs. Recheck the result in the live roster. If the increase differs from a public guide, trust the current game interface and send a correction with the update date.
Cancel the merge and record the current fighter, variant, level, damage, and cooldown before trying again.
Protect the fighter and wait. A rare or mutated duplicate can be harder to recover than a small level gain.
The merge curve is unknown, so five duplicates are not automatically five levels or a fixed XP amount.
Coverage, range, targeting, mutations, traits, uptime, and replacement difficulty can outweigh the simple comparison.
A fan page can repeat a number without proving it. This guide keeps the cap unknown until an in-game or creator-owned source confirms it.
The official description confirms that duplicate fighters merge to level a fighter. Exact XP, costs, variant rules, and the level cap are not confirmed here.
No selected official or direct in-game source currently supports a maximum level. Check the live roster instead of using an unlabelled number.
Pause and review it first. Mutation existence is official, but specific effects, rarity, and merge behavior are not documented in the selected evidence.
No. It compares values you enter before and after; it does not have a verified XP curve.
Use transparent entered values.
Review mutation and rate boundaries.
Decide what job the merge should improve.